Osamu Koizumi / Mbed OS HelloMQTT

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.

Diff: main.cpp

Revision:
19:7f7aba7a4a8b
Parent:
18:07a79d8f01c3
Child:
20:49c9daf2b0ff
--- a/main.cpp	Mon Jul 27 09:30:31 2015 +0000
+++ b/main.cpp	Thu Jul 30 13:49:18 2015 +0000
@@ -88,7 +88,7 @@
     if ((rc = client.connect(data)) != 0)
         printf("rc from MQTT connect is %d\n", rc);
     
-    if ((rc = client.subscribe(topic, MQTT::QOS1, messageArrived)) != 0)
+    if ((rc = client.subscribe(topic, MQTT::QOS2, messageArrived)) != 0)
         printf("rc from MQTT subscribe is %d\n", rc);
 
     MQTT::Message message;
@@ -122,16 +122,10 @@
         client.yield(100);
             
     if ((rc = client.unsubscribe(topic)) != 0)
-    {
-        lcd.cls();
         printf("rc from unsubscribe was %d\n", rc);
-    }
     
     if ((rc = client.disconnect()) != 0)
-    {
-        lcd.cls();
         printf("rc from disconnect was %d\n", rc);
-    }
     
     ipstack.disconnect();