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# Cayenne MQTT mbed Library
The Cayenne MQTT mbed Library provides functions to easily connect to the Cayenne IoT project builder. This library is also available on the mbed developer site [here](https://developer.mbed.org/teams/myDevicesIoT/code/Cayenne-MQTT-mbed/).

This library bundles the [Eclipse Paho MQTT C/C++ client](https://github.com/eclipse/paho.mqtt.embedded-c).

## Repository Structure
- **src** - The library source code.
  - **CayenneUtils** - Common code for creating and parsing Cayenne topics and payloads. This code can be used with any MQTT client.
  - **CayenneMQTTClient** - Platform independent Cayenne C++ library using the Paho MQTT C++ library. To create platform specific versions of this library networking and timer code for the platform are required.
  - **MQTTCommon** - Common Paho MQTT C code used by both the C and C++ libraries.
  - **Platform** - Platform specific networking and timer code, as well as test and example applications.

## Adding Additional Platforms
The Cayenne MQTT client code is platform independent but it requires platform specific code to create timers and to read and write data over the network. To add support for additional platforms you will need to create platform specific timer and networking code.
  - **Timer** - This class is used to create countdown timers. It is described in the [TimerInterface.h](https://github.com/myDevicesIoT/Cayenne-MQTT-mbed/blob/master/src/CayenneMQTTClient/TimerInterface.h) file. An example implementation for mbed is in the [mbed/MQTTTimer.h](https://github.com/myDevicesIoT/Cayenne-MQTT-mbed/blob/master/src/Platform/mbed/MQTTTimer.h) file.
  - **Network** - This class is used to read and write data over the network. It is described in the [NetworkInterface.h](https://github.com/myDevicesIoT/Cayenne-MQTT-mbed/blob/master/src/CayenneMQTTClient/NetworkInterface.h) file. An example implementation for mbed is in the [mbed/MQTTNetwork.h](https://github.com/myDevicesIoT/Cayenne-MQTT-mbed/blob/master/src/Platform/mbed/MQTTNetwork.h) file.
  
After creating new platform specific timer and networking classes you can use them by passing them as template parameters to the [MQTTClient](https://github.com/myDevicesIoT/Cayenne-MQTT-mbed/blob/master/src/CayenneMQTTClient/CayenneMQTTClient.h) class.

## Cayenne MQTT Libraries
- **[Cayenne-MQTT-C](https://github.com/myDevicesIoT/Cayenne-MQTT-C)** - C version of the Cayenne MQTT Library.
- **[Cayenne-MQTT-CPP](https://github.com/myDevicesIoT/Cayenne-MQTT-CPP)** - C++ version of the Cayenne MQTT Library.
- **[Cayenne-MQTT-Arduino](https://github.com/myDevicesIoT/Cayenne-MQTT-Arduino)** - Arduino version of the Cayenne MQTT Library.
- **[Cayenne-MQTT-mbed](https://github.com/myDevicesIoT/Cayenne-MQTT-mbed)** - mbed version of the Cayenne MQTT Library. This is also available on the mbed developer site [here](https://developer.mbed.org/teams/myDevicesIoT/code/Cayenne-MQTT-mbed/).