Esp32 release

Change to make the library compatible with Esp32 platform.
Async lib can be activated, but is not 100% bug free yet.
Big changes in tinytests example.

Bug fixes and code rewrite

• Fix a disconnect bug (No automatic test available yet)
• Big rewrite of client

Some fixes and unit tests added

• Added a mock for ESP so AUnit tests now passes
• Fix port integer size
• Fix broker bug (no close at the destruction)
• Typos in libraries text

Added unsubscribe

• Unsubscribe implemented for local mode and remote mode

Puback / Disconnect / Code clean and unit tests added

• PubAck implemented (not for Qos >0)
• Disconnect implemented
• More code clean
• Unit tests added (one is broken due to a missing feature)

Speed, stability and features

• Improved speed and stability
• MqttClient now re-subscribes upon reconnect
• Unsubscribe implemented
• Less verbose, so faster
• Fix length of client id rejection
• Improvement of tinymqtt-test.ino

Minor changes in client

• Great enhancements to tinytest.ino
• Change client so it won't use its message member (could overide incoming data)
• Minor change to Ack

MqttClient bugfixes, Broker and tester enhancements

• brokers lot of fixes
• broker supports multiple subscriptions
• client can subscribe and publish to remote broker
• removed dependency with Streaming
• client keep alive can now be choosen
• client supports suback / puback / connack
• tinymqtt-test enhancements

Bug fixes, minor API change

• Remove needs of Streaming.h when debug is not activated
• Rewrote some examples
• Added String to publish
• fix payload content
• fix crash on client timeout when not linked to a broker

First usable release

First usable release

• MqttClient can connect, subscribe and publish
• MqttBroker accepts connexions / publishes and subscribes
• Tested with MqttBox and Mqtt-Explorer
• Lot of crashes fixed, better answer to pings requests
• Added examples the tinymqtt-test.ino is a great console allowing to make any kind of test.