Introduction

I wrote this page for test the MQTT protocol between mbed <->broker <-> android

Required Components

• Mbed board
• LM75A Temperature Sensor (my notebook info)
• Broker account
• Android App MQTT Terminal (Google PLAY LINK)

How works

The goal of this project is send the temperature value read from a LM75 sensor over MQTT protocol to Android Phone.

I divided the project into the following steps:

• First step is create a Broker account, in this test I used CloudMQTT.

• Second step is download the mbed code.

• Third step is open my Android App MQTT Terminal and setup the new Broker.

First Step: Create a Broker

Press the "Control Panel" button and in the new page the button "Create":

Create a new MQTTCloud Instance:

Open the Details of new instance and Create a New User:

Now you have to create a new Rule (use the user create above and insert a new TOPIC).

OK the Broker is created.

Second Step

Download the mbed test code:

You have to change the MQTT data in main.h:

Third Step

Setup the Broker information in the Android App MQTT Terminal:

Then is necessary add a new Topic:

Conclusion

Now is possible receive data from mbed: