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:
9:5beb8609e9f7
Parent:
8:a3e3113054a1
Child:
12:086a9314e8a5
--- a/main.cpp	Tue May 20 15:08:05 2014 +0000
+++ b/main.cpp	Thu May 22 23:58:34 2014 +0000
@@ -34,21 +34,22 @@
 int arrivedcount = 0;
 
 
-void messageArrived(MQTT::Message* message)
+void messageArrived(MQTT::MessageData& md)
 {
+    MQTT::Message &message = md.message;
     lcd.cls();
     lcd.locate(0,3);
-    printf("Message arrived: qos %d, retained %d, dup %d, packetid %d\n", message->qos, message->retained, message->dup, message->id);
-    printf("Payload %.*s\n", message->payloadlen, (char*)message->payload);
+    printf("Message arrived: qos %d, retained %d, dup %d, packetid %d\n", message.qos, message.retained, message.dup, message.id);
+    printf("Payload %.*s\n", message.payloadlen, (char*)message.payload);
     ++arrivedcount;
-    lcd.puts((char*)message->payload);
+    lcd.puts((char*)message.payload);
 }
 
 
 int main(int argc, char* argv[])
 {   
     MQTTEthernet ipstack = MQTTEthernet();
-    float version = 0.46;
+    float version = 0.47;
     char* topic = "mbed-sample";
     
     lcd.printf("Version is %f\n", version);