它是一个用于Netduino平台的MQTT客户端库，用于与MQTT代理进行通信。以下是关于如何使用它的一些信息：
- 安装：您需要将NetduinoMQTT库添加到您的Netduino项目中。具体的安装步骤可能会因您的开发环境而异，通常可以通过将库文件导入到项目中或使用包管理工具来完成。
- 示例代码：README中提到了一个名为"program.cs"的示例代码文件，该文件展示了如何使用NetduinoMQTT库的一些基本功能来与MQTT代理进行交互。您可以参考这些示例代码来了解如何开始使用该库。
- 版本支持：README列出了不同版本的库支持的功能，例如连接到MQTT代理、发送MQTT消息、订阅和取消订阅主题等。您可以根据您的需求和项目要求选择适合的版本。
版本 0.01(a) 支持：
- 连接到MQTT代理服务器（已测试RSMB和mosquitto）
- 向代理服务器发送MQTT消息
- 断开与代理服务器的连接
- PING消息（用于保持连接，示例在program.cs中）
NetduinoMQTT.cs
/*
Copyright 2011-2012 Dan Anderson. All rights reserved.
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY DAN ANDERSON ''AS IS'' AND ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
SHALL Dan Anderson OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
THE POSSIBILITY OF SUCH DAMAGE.
*/
using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using Microsoft.SPOT;
using Socket = System.Net.Sockets.Socket;
namespace Netduino_MQTT_Client_Library
{
static class Constants
{
// TODO: Add other constants so we don't have "magic" numbers
public const int MQTTPROTOCOLVERSION = 3;
public const int MAXLENGTH = 268435455; // 256MB
public const int MAX_CLIENTID = 23;
public const int MIN_CLIENTID = 1;
public const int MAX_KEEPALIVE = 65535;
public const int MIN_KEEPALIVE = 0;
public const int MAX_USERNAME = 65535;
public const int MAX_PASSWORD = 65535;
public const int MAX_TOPIC_LENGTH = 32767;
public const int MIN_TOPIC_LENGTH = 1;
// Error Codes
public const int CLIENTID_LENGTH_ERROR = 1;
public const int KEEPALIVE_LENGTH_ERROR = 1;
public const int MESSAGE_LENGTH_ERROR = 1;
public const int TOPIC_LENGTH_ERROR = 1;
public const int TOPIC_WILDCARD_ERROR = 1;
public const int USERNAME_LENGTH_ERROR = 1;
public const int PASSWORD_LENGTH_ERROR = 1;
public const int CONNECTION_ERROR = 1;
public const int CONNECTION_OK = 0;
public const int CONNACK_LENGTH = 4;
public const int PINGRESP_LENGTH = 2;
public const byte MQTT_CONN_OK = 0x00; // Connection Accepted
public const byte MQTT_CONN_BAD_PROTOCOL_VERSION = 0x01; // Connection Refused: unacceptable protocol version
public const byte MQTT_CONN_BAD_IDENTIFIER = 0x02; // Connection Refused: identifier rejected
public const byte MQTT_CONN_SERVER_UNAVAILABLE = 0x03; // Connection Refused: server unavailable
public const byte MQTT_CONN_BAD_AUTH = 0x04; // Connection Refused: bad user name or password
public const byte MQTT_CONN_NOT_AUTH = 0x05; // Connection Refused: not authorized
// Message types
public const int MQTT_CONNECT_TYPE = 0x10;
public const int MQTT_CONNACK_TYPE = 0x20;
public const int MQTT_PUBLISH_TYPE = 0x30;
public const int MQTT_PING_REQ_TYPE = 0xc0;
public const int MQTT_PING_RESP_TYPE = 0xd0;
public const int MQTT_DISCONNECT_TYPE = 0xe0;
// Flags
public const int CLEAN_SESSION_FLAG = 0x02;
public const int USING_USERNAME_FLAG = 0x80;
public const int USING_PASSWORD_FLAG = 0x40;
public const int CONTINUATION_BIT = 0x80;
}
public static class NetduinoMQTT
{
public static int ConnectMQTT(Socket mySocket, String clientID, int keepAlive = 20, bool cleanSession = true, String username = "", String password = "")
{
int index = 0;
int tmp = 0;
int digit = 0;
int remainingLength = 0;
int fixedHeader = 0;
int varHeader = 0;
int payload = 0;
int returnCode = 0;
bool usingUsername = false;
bool usingPassword = false;
byte connectFlags = 0x00;
byte[] buffer = null;
UTF8Encoding encoder = new UTF8Encoding();
byte[] utf8ClientID = Encoding.UTF8.GetBytes(clientID);
byte[] utf8Username = Encoding.UTF8.GetBytes(username);
byte[] utf8Password = Encoding.UTF8.GetBytes(password);
// Some Error Checking
// ClientID improperly sized
if ((utf8ClientID.Length > Constants.MAX_CLIENTID) || (utf8ClientID.Length < Constants.MIN_CLIENTID))
return Constants.CLIENTID_LENGTH_ERROR;
// KeepAlive out of bounds
if ((keepAlive > Constants.MAX_KEEPALIVE) || (keepAlive < Constants.MIN_KEEPALIVE))
return Constants.KEEPALIVE_LENGTH_ERROR;
// Username too long
if (utf8Username.Length > Constants.MAX_USERNAME)
return Constants.USERNAME_LENGTH_ERROR;
// Password too long
if (utf8Password.Length > Constants.MAX_PASSWORD)
return Constants.PASSWORD_LENGTH_ERROR;
// Check features being used
if (!username.Equals(""))
usingUsername = true;
if (!password.Equals(""))
usingPassword = true;
// Calculate the size of the var header
varHeader += 2; // Protocol Name Length
varHeader += 6; // Protocol Name
varHeader++; // Protocol version
varHeader++; // Connect Flags
varHeader += 2; // Keep Alive
// Calculate the size of the fixed header
fixedHeader++; // byte 1
// Calculate the payload
payload = utf8ClientID.Length + 2;
if (usingUsername)
{
payload += utf8Username.Length + 2;
}
if (usingPassword)
{
payload += utf8Password.Length + 2;
}
// Calculate the remaining size
remainingLength = varHeader + payload;
// Check that remaining length will fit into 4 encoded bytes
if (remainingLength > Constants.MAXLENGTH)
return Constants.MESSAGE_LENGTH_ERROR;
tmp = remainingLength;
// Add space for each byte we need in the fixed header to store the length
while (tmp > 0)
{
fixedHeader++;
tmp = tmp / 128;
};
// End of Fixed Header
// Build buffer for message
buffer = new byte[fixedHeader + varHeader + payload];
// Fixed Header (2.1)
buffer[index++] = Constants.MQTT_CONNECT_TYPE;
// Encode the fixed header remaining length
tmp = remainingLength;
do
{
digit = tmp % 128;
tmp = tmp / 128;
if (tmp > 0)
{
digit = digit | Constants.CONTINUATION_BIT;
}
buffer[index++] = (byte)digit;
} while (tmp > 0);
// End Fixed Header
// Connect (3.1)
// Protocol Name
buffer[index++] = 0; // String (MQIsdp) Length MSB - always 6 so, zeroed
buffer[index++] = 6; // Length LSB
buffer[index++] = (byte)'M'; // M
buffer[index++] = (byte)'Q'; // Q
buffer[index++] = (byte)'I'; // I
buffer[index++] = (byte)'s'; // s
buffer[index++] = (byte)'d'; // d
buffer[index++] = (byte)'p'; // p
// Protocol Version
buffer[index++] = Constants.MQTTPROTOCOLVERSION;
// Connect Flags
// TODO: re-read the spec to figure out what the "will" stuff is about
if (cleanSession)
connectFlags |= (byte)Constants.CLEAN_SESSION_FLAG;
if (usingUsername)
connectFlags |= (byte)Constants.USING_USERNAME_FLAG;
if (usingPassword)
connectFlags |= (byte)Constants.USING_PASSWORD_FLAG;
// Set the connect flags
buffer[index++] = connectFlags;
// Keep alive (defaulted to 20 seconds above)
buffer[index++] = (byte)(keepAlive / 256); // Keep Alive MSB
buffer[index++] = (byte)(keepAlive % 256); // Keep Alive LSB
// ClientID
buffer[index++] = (byte)(utf8ClientID.Length / 256); // Length MSB
buffer[index++] = (byte)(utf8ClientID.Length % 256); // Length LSB
for (var i = 0; i < utf8ClientID.Length; i++)
{
buffer[index++] = utf8ClientID[i];
}
// Username
if (usingUsername)
{
buffer[index++] = (byte)(utf8Username.Length / 256); // Length MSB
buffer[index++] = (byte)(utf8Username.Length % 256); // Length LSB
for (var i = 0; i < utf8Username.Length; i++)
{
buffer[index++] = utf8Username[i];
}
}
// Password
if (usingPassword)
{
buffer[index++] = (byte)(utf8Password.Length / 256); // Length MSB
buffer[index++] = (byte)(utf8Password.Length % 256); // Length LSB
for (var i = 0; i < utf8Password.Length; i++)
{
buffer[index++] = utf8Password[i];
}
}
// Send the message
returnCode = mySocket.Send(buffer, index, 0);
// The return code should equal our buffer length
if (returnCode != buffer.Length)
{
return Constants.CONNECTION_ERROR;
}
// Get the acknowledgement message
returnCode = mySocket.Receive(buffer, 0);
// The length should equal 4
if (returnCode != Constants.CONNACK_LENGTH)
{
return Constants.CONNECTION_ERROR;
}
// This should be a message type 2 (CONNACK)
if (buffer[0] == Constants.MQTT_CONNACK_TYPE)
{
// This is our return code from the server
return buffer[3];
}
// If not zero = return the return code
return Constants.CONNECTION_ERROR;
}
// Publish a message to a broker (3.3)
public static int PublishMQTT(Socket mySocket, String topic, String message)
{
int index = 0;
int digit = 0;
int tmp = 0;
int fixedHeader = 0;
int varHeader = 0;
int payload = 0;
int remainingLength = 0;
byte[] buffer = null;
UTF8Encoding encoder = new UTF8Encoding();
byte[] utf8Topic = Encoding.UTF8.GetBytes(topic);
// Some error checking
// Topic contains wildcards
if ((topic.IndexOf('#') != -1) || (topic.IndexOf('+') != -1))
return Constants.TOPIC_WILDCARD_ERROR;
// Topic is too long or short
if ((utf8Topic.Length > Constants.MAX_TOPIC_LENGTH) || (utf8Topic.Length < Constants.MIN_TOPIC_LENGTH))
return Constants.TOPIC_LENGTH_ERROR;
// Calculate the size of the var header
varHeader += 2; // Topic Name Length
varHeader += utf8Topic.Length; // Topic Name
// Calculate the size of the fixed header
fixedHeader++; // byte 1
// Calculate the payload
payload = message.Length;
// Calculate the remaining size
remainingLength = varHeader + payload;
// Check that remaining length will fit into 4 encoded bytes
if (remainingLength > Constants.MAXLENGTH)
return Constants.MESSAGE_LENGTH_ERROR;
// Add space for each byte we need in the fixed header to store the length
tmp = remainingLength;
while (tmp > 0)
{
fixedHeader++;
tmp = tmp / 128;
};
// End of Fixed Header
// Build buffer for message
buffer = new byte[fixedHeader + varHeader + payload];
// Start of Fixed header
// Publish (3.3)
buffer[index++] = Constants.MQTT_PUBLISH_TYPE;
// Encode the fixed header remaining length
tmp = remainingLength;
do
{
digit = tmp % 128;
tmp = tmp / 128;
if (tmp > 0)
{
digit = digit | 0x80;
}
buffer[index++] = (byte)digit;
} while (tmp > 0);
// End of fixed header
// Start of Variable header
// Length of topic name
buffer[index++] = (byte)(utf8Topic.Length / 256); // Length MSB
buffer[index++] = (byte)(utf8Topic.Length % 256); // Length LSB
// Topic
for (var i = 0; i < utf8Topic.Length; i++)
{
buffer[index++] = utf8Topic[i];
}
// End of variable header
// Start of Payload
// Message (Length is accounted for in the fixed header)
for (var i = 0; i < message.Length; i++)
{
buffer[index++] = (byte)message[i];
}
// End of Payload
return mySocket.Send(buffer, buffer.Length, 0);
}
// Disconnect from broker (3.14)
public static int DisconnectMQTT(Socket mySocket)
{
byte[] buffer = null;
buffer = new byte[2];
buffer[0] = Constants.MQTT_DISCONNECT_TYPE;
buffer[1] = 0x00;
return mySocket.Send(buffer, buffer.Length, 0);
}
// Ping the MQTT broker - used to extend keep alive
public static int PingMQTT(Socket mySocket)
{
int index = 0;
int returnCode = 0;
byte[] buffer = null;
buffer = new byte[2];
buffer[index++] = Constants.MQTT_PING_REQ_TYPE;
buffer[index++] = 0x00;
// Send the ping
returnCode = mySocket.Send(buffer, index, 0);
// The return code should equal our buffer length
if (returnCode != buffer.Length)
{
return Constants.CONNECTION_ERROR;
}
// Get the acknowledgement message
returnCode = mySocket.Receive(buffer, 0);
// The length should equal 2
if (returnCode != Constants.PINGRESP_LENGTH)
{
return Constants.CONNECTION_ERROR;
}
// This should be a message type 2 (CONNACK)
if (buffer[0] == Constants.MQTT_PING_RESP_TYPE)
{
return 0;
}
return Constants.CONNECTION_ERROR;
}
}
}
Program.cs
/*
Copyright 2011-2012 Dan Anderson. All rights reserved.
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY DAN ANDERSON ''AS IS'' AND ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
SHALL Dan Anderson OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
THE POSSIBILITY OF SUCH DAMAGE.
*/
using System;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using Microsoft.SPOT;
using Microsoft.SPOT.Hardware;
using SecretLabs.NETMF.Hardware;
using SecretLabs.NETMF.Hardware.NetduinoPlus;
using Netduino_MQTT_Client_Library;
namespace myNetduinoMQTT
{
public class Program
{
public static void Main()
{
// setup our interrupt port (on-board button)
InterruptPort button = new InterruptPort(Pins.ONBOARD_SW1, false, Port.ResistorMode.Disabled, Port.InterruptMode.InterruptEdgeLow);
// assign our interrupt handler
button.OnInterrupt += new NativeEventHandler(button_OnInterrupt);
// go to sleep until the interrupt wakes us (saves power)
Thread.Sleep(Timeout.Infinite);
}
// the interrupt handler
static void button_OnInterrupt(uint data1, uint data2, DateTime time)
{
int returnCode = 0;
int connectionError = 0;
// Get broker's IP address.
IPHostEntry hostEntry = Dns.GetHostEntry("192.168.1.106");
// Create socket and connect to the broker's IP address and port
Socket mySocket = new Socket(AddressFamily.InterNetwork,SocketType.Stream, ProtocolType.Tcp);
try
{
mySocket.Connect(new IPEndPoint(hostEntry.AddressList[0], 1883));
}
catch (SocketException SE)
{
Debug.Print("Connection Error");
connectionError = 1;
}
if (connectionError != 1)
{
// Send the connect message
returnCode = NetduinoMQTT.ConnectMQTT(mySocket, "tester\u00A5", 2, true, "roger\u00A5", "password\u00A5");
if (returnCode != 0)
{
Debug.Print("Connection Error:");
Debug.Print(returnCode.ToString());
}
else
{
// Send our message
NetduinoMQTT.PublishMQTT(mySocket, "test", "Ow! Quit it!");
for (int i = 0; i < 11; i++)
{
returnCode = NetduinoMQTT.PingMQTT(mySocket);
if (returnCode == 0)
{
Debug.Print("Ping Received");
Thread.Sleep(1000);
}
}
Thread.Sleep(3000);
// Send the disconnect message
NetduinoMQTT.DisconnectMQTT(mySocket);
}
// Close the socket
mySocket.Close();
}
}
}
}版本 0.02 支持：
- 包括版本 0.01(a) 的所有功能
- 订阅和取消订阅
- 客户端将响应代理服务器的PING请求
- 为了避免占用过多内存，各个字段的大小已经被任意缩短。
NetduinoMQTT.cs
/*
Copyright 2011-2012 Dan Anderson. All rights reserved.
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY DAN ANDERSON ''AS IS'' AND ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
SHALL DAN ANDERSON OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
THE POSSIBILITY OF SUCH DAMAGE.
*/
using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using Microsoft.SPOT;
using Microsoft.SPOT.Hardware;
using Socket = System.Net.Sockets.Socket;
namespace Netduino_MQTT_Client_Library
{
static class Constants
{
// These have been scaled down to the hardware
// Maximum values are commented out - you can
// adjust, but keep in mind the limits of the hardware
public const int MQTTPROTOCOLVERSION = 3;
//public const int MAXLENGTH = 268435455; // 256MB
public const int MAXLENGTH = 10240; // 10K
public const int MAX_CLIENTID = 23;
public const int MIN_CLIENTID = 1;
public const int MAX_KEEPALIVE = 65535;
public const int MIN_KEEPALIVE = 0;
//public const int MAX_USERNAME = 65535;
//public const int MAX_PASSWORD = 65535;
public const int MAX_USERNAME = 12;
public const int MAX_PASSWORD = 12;
//public const int MAX_TOPIC_LENGTH = 32767;
public const int MAX_TOPIC_LENGTH = 256;
public const int MIN_TOPIC_LENGTH = 1;
public const int MAX_MESSAGEID = 65535;
// Error Codes
public const int CLIENTID_LENGTH_ERROR = 1;
public const int KEEPALIVE_LENGTH_ERROR = 1;
public const int MESSAGE_LENGTH_ERROR = 1;
public const int TOPIC_LENGTH_ERROR = 1;
public const int TOPIC_WILDCARD_ERROR = 1;
public const int USERNAME_LENGTH_ERROR = 1;
public const int PASSWORD_LENGTH_ERROR = 1;
public const int CONNECTION_ERROR = 1;
public const int ERROR = 1;
public const int SUCCESS = 0;
public const int CONNECTION_OK = 0;
public const int CONNACK_LENGTH = 4;
public const int PINGRESP_LENGTH = 2;
public const byte MQTT_CONN_OK = 0x00; // Connection Accepted
public const byte MQTT_CONN_BAD_PROTOCOL_VERSION = 0x01; // Connection Refused: unacceptable protocol version
public const byte MQTT_CONN_BAD_IDENTIFIER = 0x02; // Connection Refused: identifier rejected
public const byte MQTT_CONN_SERVER_UNAVAILABLE = 0x03; // Connection Refused: server unavailable
public const byte MQTT_CONN_BAD_AUTH = 0x04; // Connection Refused: bad user name or password
public const byte MQTT_CONN_NOT_AUTH = 0x05; // Connection Refused: not authorized
// Message types
public const byte MQTT_CONNECT_TYPE = 0x10;
public const byte MQTT_CONNACK_TYPE = 0x20;
public const byte MQTT_PUBLISH_TYPE = 0x30;
public const byte MQTT_PING_REQ_TYPE = 0xc0;
public const byte MQTT_PING_RESP_TYPE = 0xd0;
public const byte MQTT_DISCONNECT_TYPE = 0xe0;
public const byte MQTT_SUBSCRIBE_TYPE = 0x82;
public const byte MQTT_UNSUBSCRIBE_TYPE = 0xa2;
// Flags
public const int CLEAN_SESSION_FLAG = 0x02;
public const int USING_USERNAME_FLAG = 0x80;
public const int USING_PASSWORD_FLAG = 0x40;
public const int CONTINUATION_BIT = 0x80;
}
public static class NetduinoMQTT
{
// Setup our random number generator
private static Random rand = new Random((int)(Utility.GetMachineTime().Ticks & 0xffffffff));
//***************************************************************
// Send Messages
//***************************************************************
// Connect to the MQTT Server
public static int ConnectMQTT(Socket mySocket, String clientID, int keepAlive = 20, bool cleanSession = true, String username = "", String password = "")
{
int index = 0;
int tmp = 0;
int remainingLength = 0;
int fixedHeader = 0;
int varHeader = 0;
int payload = 0;
int returnCode = 0;
bool usingUsername = false;
bool usingPassword = false;
byte connectFlags = 0x00;
byte[] buffer = null;
byte[] inputBuffer = new byte[1];
byte firstByte = 0x00;
UTF8Encoding encoder = new UTF8Encoding();
byte[] utf8ClientID = Encoding.UTF8.GetBytes(clientID);
byte[] utf8Username = Encoding.UTF8.GetBytes(username);
byte[] utf8Password = Encoding.UTF8.GetBytes(password);
// Some Error Checking
// ClientID improperly sized
if ((utf8ClientID.Length > Constants.MAX_CLIENTID) || (utf8ClientID.Length < Constants.MIN_CLIENTID))
return Constants.CLIENTID_LENGTH_ERROR;
// KeepAlive out of bounds
if ((keepAlive > Constants.MAX_KEEPALIVE) || (keepAlive < Constants.MIN_KEEPALIVE))
return Constants.KEEPALIVE_LENGTH_ERROR;
// Username too long
if (utf8Username.Length > Constants.MAX_USERNAME)
return Constants.USERNAME_LENGTH_ERROR;
// Password too long
if (utf8Password.Length > Constants.MAX_PASSWORD)
return Constants.PASSWORD_LENGTH_ERROR;
// Check features being used
if (!username.Equals(""))
usingUsername = true;
if (!password.Equals(""))
usingPassword = true;
// Calculate the size of the var header
varHeader += 2; // Protocol Name Length
varHeader += 6; // Protocol Name
varHeader++; // Protocol version
varHeader++; // Connect Flags
varHeader += 2; // Keep Alive
// Calculate the size of the fixed header
fixedHeader++; // byte 1
// Calculate the payload
payload = utf8ClientID.Length + 2;
if (usingUsername)
{
payload += utf8Username.Length + 2;
}
if (usingPassword)
{
payload += utf8Password.Length + 2;
}
// Calculate the remaining size
remainingLength = varHeader + payload;
// Check that remaining length will fit into 4 encoded bytes
if (remainingLength > Constants.MAXLENGTH)
return Constants.MESSAGE_LENGTH_ERROR;
tmp = remainingLength;
// Add space for each byte we need in the fixed header to store the length
while (tmp > 0)
{
fixedHeader++;
tmp = tmp / 128;
};
// End of Fixed Header
// Build buffer for message
buffer = new byte[fixedHeader + varHeader + payload];
// Fixed Header (2.1)
buffer[index++] = Constants.MQTT_CONNECT_TYPE;
// Encode the fixed header remaining length
// Add remaining length
index = doRemainingLength(remainingLength, index, buffer);
// End Fixed Header
// Connect (3.1)
// Protocol Name
buffer[index++] = 0; // String (MQIsdp) Length MSB - always 6 so, zeroed
buffer[index++] = 6; // Length LSB
buffer[index++] = (byte)'M'; // M
buffer[index++] = (byte)'Q'; // Q
buffer[index++] = (byte)'I'; // I
buffer[index++] = (byte)'s'; // s
buffer[index++] = (byte)'d'; // d
buffer[index++] = (byte)'p'; // p
// Protocol Version
buffer[index++] = Constants.MQTTPROTOCOLVERSION;
// Connect Flags
if (cleanSession)
connectFlags |= (byte)Constants.CLEAN_SESSION_FLAG;
if (usingUsername)
connectFlags |= (byte)Constants.USING_USERNAME_FLAG;
if (usingPassword)
connectFlags |= (byte)Constants.USING_PASSWORD_FLAG;
// Set the connect flags
buffer[index++] = connectFlags;
// Keep alive (defaulted to 20 seconds above)
buffer[index++] = (byte)(keepAlive / 256); // Keep Alive MSB
buffer[index++] = (byte)(keepAlive % 256); // Keep Alive LSB
// ClientID
buffer[index++] = (byte)(utf8ClientID.Length / 256); // Length MSB
buffer[index++] = (byte)(utf8ClientID.Length % 256); // Length LSB
for (var i = 0; i < utf8ClientID.Length; i++)
{
buffer[index++] = utf8ClientID[i];
}
// Username
if (usingUsername)
{
buffer[index++] = (byte)(utf8Username.Length / 256); // Length MSB
buffer[index++] = (byte)(utf8Username.Length % 256); // Length LSB
for (var i = 0; i < utf8Username.Length; i++)
{
buffer[index++] = utf8Username[i];
}
}
// Password
if (usingPassword)
{
buffer[index++] = (byte)(utf8Password.Length / 256); // Length MSB
buffer[index++] = (byte)(utf8Password.Length % 256); // Length LSB
for (var i = 0; i < utf8Password.Length; i++)
{
buffer[index++] = utf8Password[i];
}
}
// Send the message
returnCode = mySocket.Send(buffer, index, 0);
// The return code should equal our buffer length
if (returnCode != buffer.Length)
{
return Constants.CONNECTION_ERROR;
}
// Get the acknowledgement message
returnCode = mySocket.Receive(inputBuffer, 0);
if (returnCode < 1)
return Constants.CONNECTION_ERROR;
firstByte = inputBuffer[0];
// If this is the CONNACK - pass it to the CONNACK handler
if (((int)firstByte & Constants.MQTT_CONNACK_TYPE) > 0)
{
returnCode = handleCONNACK(mySocket, firstByte);
if (returnCode > 0)
{
return Constants.ERROR;
}
}
return Constants.SUCCESS;
}
// Publish a message to a broker (3.3)
public static int PublishMQTT(Socket mySocket, String topic, String message)
{
int index = 0;
int tmp = 0;
int fixedHeader = 0;
int varHeader = 0;
int payload = 0;
int remainingLength = 0;
int returnCode = 0;
byte[] buffer = null;
// Setup a UTF8 encoder
UTF8Encoding encoder = new UTF8Encoding();
// Encode the topic
byte[] utf8Topic = Encoding.UTF8.GetBytes(topic);
// Some error checking
// Topic contains wildcards
if ((topic.IndexOf('#') != -1) || (topic.IndexOf('+') != -1))
return Constants.TOPIC_WILDCARD_ERROR;
// Topic is too long or short
if ((utf8Topic.Length > Constants.MAX_TOPIC_LENGTH) || (utf8Topic.Length < Constants.MIN_TOPIC_LENGTH))
return Constants.TOPIC_LENGTH_ERROR;
// Calculate the size of the var header
varHeader += 2; // Topic Name Length (MSB, LSB)
varHeader += utf8Topic.Length; // Length of the topic
// Calculate the size of the fixed header
fixedHeader++; // byte 1
// Calculate the payload
payload = message.Length;
// Calculate the remaining size
remainingLength = varHeader + payload;
// Check that remaining length will fit into 4 encoded bytes
if (remainingLength > Constants.MAXLENGTH)
return Constants.MESSAGE_LENGTH_ERROR;
// Add space for each byte we need in the fixed header to store the length
tmp = remainingLength;
while (tmp > 0)
{
fixedHeader++;
tmp = tmp / 128;
};
// End of Fixed Header
// Build buffer for message
buffer = new byte[fixedHeader + varHeader + payload];
// Start of Fixed header
// Publish (3.3)
buffer[index++] = Constants.MQTT_PUBLISH_TYPE;
// Encode the fixed header remaining length
// Add remaining length
index = doRemainingLength(remainingLength, index, buffer);
// End Fixed Header
// Start of Variable header
// Length of topic name
buffer[index++] = (byte)(utf8Topic.Length / 256); // Length MSB
buffer[index++] = (byte)(utf8Topic.Length % 256); // Length LSB
// Topic
for (var i = 0; i < utf8Topic.Length; i++)
{
buffer[index++] = utf8Topic[i];
}
// End of variable header
// Start of Payload
// Message (Length is accounted for in the fixed header)
for (var i = 0; i < message.Length; i++)
{
buffer[index++] = (byte)message[i];
}
// End of Payload
returnCode = mySocket.Send(buffer, buffer.Length, 0);
if (returnCode < buffer.Length)
return Constants.CONNECTION_ERROR;
return Constants.SUCCESS;
}
// Disconnect from broker (3.14)
public static int DisconnectMQTT(Socket mySocket)
{
byte[] buffer = null;
int returnCode = 0;
buffer = new byte[2];
buffer[0] = Constants.MQTT_DISCONNECT_TYPE;
buffer[1] = 0x00;
returnCode = mySocket.Send(buffer, buffer.Length, 0);
if (returnCode < buffer.Length)
return Constants.CONNECTION_ERROR;
return Constants.SUCCESS; ;
}
// Subscribe to a topic
public static int SubscribeMQTT(Socket mySocket, String[] topic, int[] QoS, int topics)
{
int index = 0;
int index2 = 0;
int messageIndex = 0;
int messageID = 0;
int tmp = 0;
int fixedHeader = 0;
int varHeader = 0;
int payloadLength = 0;
int remainingLength = 0;
int returnCode = 0;
byte[] buffer = null;
byte[][] utf8Topics = null;
UTF8Encoding encoder = new UTF8Encoding();
utf8Topics = new byte[topics][];
while (index < topics)
{
utf8Topics[index] = new byte[Encoding.UTF8.GetBytes(topic[index]).Length];
utf8Topics[index] = Encoding.UTF8.GetBytes(topic[index]);
if ((utf8Topics[index].Length > Constants.MAX_TOPIC_LENGTH) || (utf8Topics[index].Length < Constants.MIN_TOPIC_LENGTH))
{
return Constants.TOPIC_LENGTH_ERROR;
}
else
{
payloadLength += 2; // Size (LSB + MSB)
payloadLength += utf8Topics[index].Length; // Length of topic
payloadLength++; // QoS Requested
index++;
}
}
// Calculate the size of the fixed header
fixedHeader++; // byte 1
// Calculate the size of the var header
varHeader += 2; // Message ID is 2 bytes
// Calculate the remaining size
remainingLength = varHeader + payloadLength;
// Check that remaining encoded length will fit into 4 encoded bytes
if (remainingLength > Constants.MAXLENGTH)
return Constants.MESSAGE_LENGTH_ERROR;
// Add space for each byte we need in the fixed header to store the length
tmp = remainingLength;
while (tmp > 0)
{
fixedHeader++;
tmp = tmp / 128;
};
// Build buffer for message
buffer = new byte[fixedHeader + varHeader + payloadLength];
// Start of Fixed header
// Publish (3.3)
buffer[messageIndex++] = Constants.MQTT_SUBSCRIBE_TYPE;
// Add remaining length
messageIndex = doRemainingLength(remainingLength, messageIndex, buffer);
// End Fixed Header
// Start of Variable header
// Message ID
messageID = rand.Next(Constants.MAX_MESSAGEID);
Debug.Print("SUBSCRIBE: Message ID: " + messageID);
buffer[messageIndex++] = (byte)(messageID / 256); // Length MSB
buffer[messageIndex++] = (byte)(messageID % 256); // Length LSB
// End of variable header
// Start of Payload
index = 0;
while (index < topics)
{
// Length of Topic
buffer[messageIndex++] = (byte)(utf8Topics[index].Length / 256); // Length MSB
buffer[messageIndex++] = (byte)(utf8Topics[index].Length % 256); // Length LSB
index2 = 0;
while (index2 < utf8Topics[index].Length)
{
buffer[messageIndex++] = utf8Topics[index][index2];
index2++;
}
buffer[messageIndex++] = (byte)(QoS[index]);
index++;
}
// End of Payload
returnCode = mySocket.Send(buffer, buffer.Length, 0);
if (returnCode < buffer.Length)
return Constants.CONNECTION_ERROR;
return Constants.SUCCESS;
}
// Unsubscribe to a topic
public static int UnsubscribeMQTT(Socket mySocket, String[] topic, int[] QoS, int topics)
{
int index = 0;
int index2 = 0;
int messageIndex = 0;
int messageID = 0;
int tmp = 0;
int fixedHeader = 0;
int varHeader = 0;
int payloadLength = 0;
int remainingLength = 0;
int returnCode = 0;
byte[] buffer = null;
byte[][] utf8Topics = null;
UTF8Encoding encoder = new UTF8Encoding();
utf8Topics = new byte[topics][];
while (index < topics)
{
utf8Topics[index] = new byte[Encoding.UTF8.GetBytes(topic[index]).Length];
utf8Topics[index] = Encoding.UTF8.GetBytes(topic[index]);
if ((utf8Topics[index].Length > Constants.MAX_TOPIC_LENGTH) || (utf8Topics[index].Length < Constants.MIN_TOPIC_LENGTH))
{
return Constants.TOPIC_LENGTH_ERROR;
}
else
{
payloadLength += 2; // Size (LSB + MSB)
payloadLength += utf8Topics[index].Length; // Length of topic
index++;
}
}
// Calculate the size of the fixed header
fixedHeader++; // byte 1
// Calculate the size of the var header
varHeader += 2; // Message ID is 2 bytes
// Calculate the remaining size
remainingLength = varHeader + payloadLength;
// Check that remaining encoded length will fit into 4 encoded bytes
if (remainingLength > Constants.MAXLENGTH)
return Constants.MESSAGE_LENGTH_ERROR;
// Add space for each byte we need in the fixed header to store the length
tmp = remainingLength;
while (tmp > 0)
{
fixedHeader++;
tmp = tmp / 128;
};
// Build buffer for message
buffer = new byte[fixedHeader + varHeader + payloadLength];
// Start of Fixed header
// Publish (3.3)
buffer[messageIndex++] = Constants.MQTT_UNSUBSCRIBE_TYPE;
// Add remaining length - writes to buffer, so need to get the new index back
messageIndex = doRemainingLength(remainingLength, messageIndex, buffer);
// End Fixed Header
// Start of Variable header
// Message ID
messageID = rand.Next(Constants.MAX_MESSAGEID);
Debug.Print("UNSUBSCRIBE: Message ID: " + messageID);
buffer[messageIndex++] = (byte)(messageID / 256); // Length MSB
buffer[messageIndex++] = (byte)(messageID % 256); // Length LSB
// End of variable header
// Start of Payload
index = 0;
while (index < topics)
{
// Length of Topic
buffer[messageIndex++] = (byte)(utf8Topics[index].Length / 256); // Length MSB
buffer[messageIndex++] = (byte)(utf8Topics[index].Length % 256); // Length LSB
index2 = 0;
while (index2 < utf8Topics[index].Length)
{
buffer[messageIndex++] = utf8Topics[index][index2];
index2++;
}
index++;
}
// End of Payload
returnCode = mySocket.Send(buffer, buffer.Length, 0);
if (returnCode < buffer.Length)
return Constants.CONNECTION_ERROR;
return Constants.SUCCESS;
}
// Respond to a PINGRESP
public static int sendPINGRESP(Socket mySocket)
{
int index = 0;
int returnCode = 0;
byte[] buffer = new byte[2];
buffer[index++] = Constants.MQTT_PING_RESP_TYPE;
buffer[index++] = 0x00;
// Send the ping
returnCode = mySocket.Send(buffer, index, 0);
// The return code should equal our buffer length
if (returnCode != buffer.Length)
{
return Constants.CONNECTION_ERROR;
}
return Constants.SUCCESS;
}
// Ping the MQTT broker - used to extend keep alive
public static int PingMQTT(Socket mySocket)
{
int index = 0;
int returnCode = 0;
byte[] buffer = new byte[2];
buffer[index++] = Constants.MQTT_PING_REQ_TYPE;
buffer[index++] = 0x00;
// Send the ping
returnCode = mySocket.Send(buffer, index, 0);
// The return code should equal our buffer length
if (returnCode != buffer.Length)
{
return Constants.CONNECTION_ERROR;
}
return Constants.SUCCESS;
}
//***************************************************************
// Utility Functions
//***************************************************************
// Append the remaining length field for the fixed header
public static int doRemainingLength(int remainingLength, int index, byte[] buffer)
{
int digit = 0;
do
{
digit = remainingLength % 128;
remainingLength /= 128;
if (remainingLength > 0)
{
digit = digit | Constants.CONTINUATION_BIT;
}
buffer[index++] = (byte)digit;
} while (remainingLength > 0);
return index;
}
// Extract the remaining length field from the fixed header
public static int undoRemainingLength(Socket mySocket)
{
int multiplier = 1;
int count = 0;
int digit = 0;
int remainingLength = 0;
byte[] nextByte = new byte[1];
do
{
if (mySocket.Receive(nextByte, 0) == 1)
{
digit = (byte)nextByte[0];
remainingLength += ((digit & 0x7F) * multiplier);
multiplier *= 128;
}
count++;
} while (((digit & 0x80) != 0) && count <4);
return remainingLength;
}
//***************************************************************
// Main Listener loop
//***************************************************************
// Listen for data on the socket - call appropriate handlers based on first byte
public static int listen(Socket mySocket)
{
int returnCode = 0;
byte first = 0x00;
byte[] buffer = new byte[1];
while (true)
{
returnCode = mySocket.Receive(buffer, 0);
if (returnCode > 0)
{
Debug.Print("Data Received");
first = buffer[0];
switch (first >> 4)
{
case 0: // Reserved
Debug.Print("First Reserved Message received");
returnCode = Constants.ERROR;
break;
case 1: // Connect (Broker Only)
Debug.Print("CONNECT Message received");
returnCode = Constants.ERROR;
break;
case 2: // CONNACK
Debug.Print("CONNACK Message received");
returnCode = handleCONNACK(mySocket, first);
break;
case 3: // PUBLISH
Debug.Print("PUBLISH Message received");
returnCode = handlePUBLISH(mySocket, first);
break;
case 4: // PUBACK (QoS > 0 - did it anyway)
Debug.Print("PUBACK Message received");
returnCode = handlePUBACK(mySocket, first);
break;
case 5: // PUBREC (QoS 2)
Debug.Print("PUBREC Message received");
returnCode = Constants.ERROR;
break;
case 6: // PUBREL (QoS 2)
Debug.Print("PUBREL Message received");
returnCode = Constants.ERROR;
break;
case 7: // PUBCOMP (QoS 2)
Debug.Print("PUBCOMP Message received");
returnCode = Constants.ERROR;
break;
case 8: // SUBSCRIBE (Broker only)
Debug.Print("SUBSCRIBE Message received");
returnCode = Constants.ERROR;
break;
case 9: // SUBACK
Debug.Print("SUBACK Message received");
returnCode = handleSUBACK(mySocket, first);
break;
case 10: // UNSUBSCRIBE (Broker Only)
Debug.Print("UNSUBSCRIBE Message received");
returnCode = Constants.ERROR;
break;
case 11: // UNSUBACK
Debug.Print("UNSUBACK Message received");
returnCode = handleUNSUBACK(mySocket, first);
break;
case 12: // PINGREQ (Technically a Broker Deal - but we're doing it anyway)
Debug.Print("PINGREQ Message received");
returnCode = handlePINGREQ(mySocket, first);
break;
case 13: // PINGRESP
Debug.Print("PINGRESP Message received");
returnCode = handlePINGRESP(mySocket, first);
break;
case 14: // DISCONNECT (Broker Only)
Debug.Print("DISCONNECT Message received");
returnCode = Constants.ERROR;
break;
case 15: // Reserved
Debug.Print("Last Reserved Message received");
returnCode = Constants.ERROR;
break;
default: // Default action
Debug.Print("Unknown Message received"); // Should never get here
returnCode = Constants.ERROR;
break;
}
if (returnCode != Constants.SUCCESS)
{
Debug.Print("An error occurred in message processing");
}
}
}
}
//***************************************************************
// Message handlers (received)
//***************************************************************
public static int handleSUBACK(Socket mySocket, byte firstByte)
{
int remainingLength = 0;
int messageID = 0;
int index = 0;
int QoSIndex = 0;
int[] QoS = null;
byte[] buffer = null;
remainingLength = undoRemainingLength(mySocket);
buffer = new byte[remainingLength];
if ((mySocket.Receive(buffer, 0) != remainingLength) || remainingLength < 3)
return Constants.ERROR;
messageID += buffer[index++] * 256;
messageID += buffer[index++];
Debug.Print("SUBACK: Message ID: " + messageID);
do
{
QoS = new int[remainingLength - 2];
QoS[QoSIndex++] = buffer[index++];
Debug.Print("SUBACK: QoS Granted: " + QoS[QoSIndex-1]);
} while(index < remainingLength);
return Constants.SUCCESS;
}
// Messages from the broker come back to us as publish messages
public static int handlePUBLISH(Socket mySocket, byte firstByte)
{
int remainingLength = 0;
int messageID = 0;
int topicLength = 0;
int topicIndex = 0;
int payloadIndex = 0;
int index = 0;
byte[] buffer = null;
byte[] topic = null;
byte[] payload = null;
int QoS = 0x00;
String topicString = null;
String payloadString = null;
remainingLength = undoRemainingLength(mySocket);
buffer = new byte[remainingLength];
if ((mySocket.Receive(buffer, 0) != remainingLength) || remainingLength < 5)
return Constants.ERROR;
topicLength += buffer[index++] * 256;
topicLength += buffer[index++];
topic = new byte[topicLength];
while (topicIndex < topicLength)
{
topic[topicIndex++] = buffer[index++];
}
QoS = firstByte & 0x06;
if (QoS > 0)
{
messageID += buffer[index++] * 256;
messageID += buffer[index++];
Debug.Print("PUBLISH: Message ID: " + messageID);
}
topicString = new String(Encoding.UTF8.GetChars(topic));
Debug.Print("PUBLISH: Topic: " + topicString);
payload = new byte[remainingLength - index];
while (index < remainingLength)
{
payload[payloadIndex++] = buffer[index++];
}
Debug.Print("PUBLISH: Payload Length: " + payload.Length);
// This doesn't work if the payload isn't UTF8
payloadString = new String(Encoding.UTF8.GetChars(payload));
Debug.Print("PUBLISH: Payload: " + payloadString);
return Constants.SUCCESS;
}
public static int handleUNSUBACK(Socket mySocket, byte firstByte)
{
int returnCode = 0;
int messageID = 0;
byte[] buffer = new byte[3];
returnCode = mySocket.Receive(buffer, 0);
if ((buffer[0] != 2) || (returnCode != 3))
return Constants.ERROR;
messageID += buffer[1] * 256;
messageID += buffer[2];
Debug.Print("UNSUBACK: Message ID: " + messageID);
return Constants.SUCCESS;
}
// Ping response - this should be a total of 2 bytes - that's pretty much
// all I'm looking for.
public static int handlePINGRESP(Socket mySocket, byte firstByte)
{
int returnCode = 0;
Debug.Print("Ping Response Received");
byte[] buffer = new byte[1];
returnCode = mySocket.Receive(buffer, 0);
if ((buffer[0] != 0) || (returnCode != 1))
{
return Constants.ERROR;
}
return Constants.SUCCESS;
}
// Ping Request
public static int handlePINGREQ(Socket mySocket, byte firstByte)
{
int returnCode = 0;
byte[] buffer = new byte[1];
returnCode = mySocket.Receive(buffer, 0);
if((returnCode != 1) || (buffer[0] != 0))
return Constants.ERROR;
returnCode = sendPINGRESP(mySocket);
if (returnCode != 0)
return Constants.ERROR;
return Constants.SUCCESS;
}
// Connect acknowledgement - returns 3 more bytes, byte 3
// should be 0 for success
public static int handleCONNACK(Socket mySocket, byte firstByte)
{
int returnCode = 0;
byte[] buffer = new byte[3];
returnCode = mySocket.Receive(buffer, 0);
if ((buffer[0] != 2) || (buffer[2] > 0) || (returnCode != 3))
return Constants.ERROR;
return Constants.SUCCESS;
}
// We're not doing QoS 1 yet, so this is just here for flushing
// and to notice if we are getting this message for some reason
public static int handlePUBACK(Socket mySocket, byte firstByte)
{
int returnCode = 0;
int messageID = 0;
byte[] buffer = new byte[3];
returnCode = mySocket.Receive(buffer, 0);
if ((buffer[0] != 2) || (returnCode != 3))
return Constants.ERROR;
messageID += buffer[1] * 256;
messageID += buffer[2];
Debug.Print("PUBACK: Message ID: " + messageID);
return Constants.SUCCESS;
}
}
}
Program.cs
/*
Copyright 2011-2012 Dan Anderson. All rights reserved.
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY DAN ANDERSON ''AS IS'' AND ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
SHALL DAN ANDERSON OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
THE POSSIBILITY OF SUCH DAMAGE.
*/
using System;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using Microsoft.SPOT;
using Microsoft.SPOT.Hardware;
using SecretLabs.NETMF.Hardware;
using SecretLabs.NETMF.Hardware.NetduinoPlus;
using Netduino_MQTT_Client_Library;
namespace myNetduinoMQTT
{
public class Program
{
static Thread listenerThread;
static Socket mySocket = null;
public static void Main()
{
int returnCode = 0;
// You can subscribe to multiple topics in one go
// (If your broker supports this RSMB does, mosquitto does not)
// Our examples use one topic per request.
//
//int[] topicQoS = { 0, 0 };
//String[] subTopics = { "test", "test2" };
//int numTopics = 2;
int[] topicQoS = { 0 };
String[] subTopics = { "test" };
int numTopics = 1;
// Get broker's IP address.
//IPHostEntry hostEntry = Dns.GetHostEntry("test.mosquitto.org");
IPHostEntry hostEntry = Dns.GetHostEntry("192.168.1.106");
// Create socket and connect to the broker's IP address and port
mySocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
try
{
mySocket.Connect(new IPEndPoint(hostEntry.AddressList[0], 1883));
}
catch (SocketException SE)
{
Debug.Print("Connection Error: " + SE.ErrorCode);
return;
}
// Send the connect message
// You can use UTF8 in the clientid, username and password - be careful, this can be a pain
//returnCode = NetduinoMQTT.ConnectMQTT(mySocket, "tester\u00A5", 2000, true, "roger\u00A5", "password\u00A5");
returnCode = NetduinoMQTT.ConnectMQTT(mySocket, "tester402", 20, true, "roger", "password");
if (returnCode != 0)
{
Debug.Print("Connection Error: " + returnCode.ToString());
return;
}
// Set up so that we ping the server after 1 second, then every 10 seconds
// First time is initial delay, Second is subsequent delays
Timer pingTimer = new Timer(new TimerCallback(pingIt), null, 1000, 10000);
// Setup and start a new thread for the listener
listenerThread = new Thread(mylistenerThread);
listenerThread.Start();
// setup our interrupt port (on-board button)
InterruptPort button = new InterruptPort(Pins.ONBOARD_SW1, false, Port.ResistorMode.Disabled, Port.InterruptMode.InterruptEdgeLow);
// assign our interrupt handler
button.OnInterrupt += new NativeEventHandler(button_OnInterrupt);
// Subscribe to our topic(s)
returnCode = NetduinoMQTT.SubscribeMQTT(mySocket, subTopics, topicQoS, numTopics);
//***********************************************
// This is just some example stuff:
//***********************************************
// Publish a message
NetduinoMQTT.PublishMQTT(mySocket, "test", "Testing from NetduinoMQTT");
// Subscribe to "test/two"
subTopics[0] = "test/two";
returnCode = NetduinoMQTT.SubscribeMQTT(mySocket, subTopics, topicQoS, numTopics);
// Send a message to "test/two"
NetduinoMQTT.PublishMQTT(mySocket, "test/two", "Testing from NetduinoMQTT to test/two");
// Unsubscribe from "test/two"
returnCode = NetduinoMQTT.UnsubscribeMQTT(mySocket, subTopics, topicQoS, numTopics);
// go to sleep until the interrupt or the timer wakes us
// (mylistenerThread is in a seperate thread that continues)
Thread.Sleep(Timeout.Infinite);
}
// the interrupt handler for the button
static void button_OnInterrupt(uint data1, uint data2, DateTime time)
{
// Send our message
NetduinoMQTT.PublishMQTT(mySocket, "test", "Ow! Quit it!");
return;
}
// The thread that listens for inbound messages
private static void mylistenerThread()
{
NetduinoMQTT.listen(mySocket);
}
// The function that the timer calls to ping the server
// Our keep alive is 15 seconds - we ping again every 10.
// So we should live forever.
static void pingIt(object o)
{
Debug.Print("pingIT");
NetduinoMQTT.PingMQTT(mySocket);
}
}
}
