HelloMQTT over TLS.

Dependencies:   MQTT

Fork of HelloMQTT by Osamu Koizumi

HelloMQTT over TLS

This program is a fork of HelloMQTT. Added TLS capability by using TLSSocket library. Tested on K64F.

This sample program connects to iot.eclipse.org:8883 by default. Verifies server identification. Subscribes a certain topic. Then publishes three messages with different QoSs, i.e. QoS0, QoS1, and QoS2.

Warning

Some brokers do not accept QoS2 and/or QoS1 message. For example, AWS IoT Message Broker doesn't accept QoS2. In such broker, this program doesn't work as is. Change QoS level.

Output from console

HelloMQTT: version is 0.70

Opening network interface...
Network interface opened successfully.

Connecting to host iot.eclipse.org:8883 ...
Connection established.

MQTT client is trying to connect the server ...
Client connected.

Client is trying to subscribe a topic "mbed-test".
Client has subscribed a topic "mbed-test".

Client publishes messages ...
Publishing message QoS 0.
QoS 0 message published.
! Message arrived: qos 0, retained 0, dup 0, packetid 6257
! Payload Hello World!  QoS 0 message from app version 0.700000

Publishing message QoS 1.
QoS 1 message published.
! Message arrived: qos 1, retained 0, dup 0, packetid 1
! Payload Hello World!  QoS 1 message from app version 0.700000

Publishing message QoS 2.
QoS 2 message published.
! Message arrived: qos 2, retained 0, dup 0, packetid 2
! Payload Hello World!  QoS 2 message from app version 0.700000

Version 0.70: finish 3 msgs

Known Issues

On K64F, when serial baud rate is changed from 9600 to 115200, program fails.

Revision:
20:49c9daf2b0ff
Child:
21:a68bd76740f9
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MQTTNetwork.h	Tue Jan 10 18:10:17 2017 -0600
@@ -0,0 +1,38 @@
+#ifndef _MQTTNETWORK_H_
+#define _MQTTNETWORK_H_
+
+#include "NetworkInterface.h"
+
+class MQTTNetwork {
+public:
+    MQTTNetwork(NetworkInterface* aNetwork) : network(aNetwork) {
+        socket = new TCPSocket();
+    }
+
+    ~MQTTNetwork() {
+        delete socket;
+    }
+
+    int read(unsigned char* buffer, int len, int timeout) {
+        return socket->recv(buffer, len);
+    }
+
+    int write(unsigned char* buffer, int len, int timeout) {
+        return socket->send(buffer, len);
+    }
+
+    int connect(const char* hostname, int port) {
+        socket->open(network);
+        return socket->connect(hostname, port);
+    }
+
+    void disconnect() {
+
+    }
+
+private:
+    NetworkInterface* network;
+    TCPSocket* socket;
+};
+
+#endif // _MQTTNETWORK_H_