h2zero 5dac1a7035 Add immediate parameter to BLE connection commands. (#1137)
* Add immediate parameter to BLE connection commands.

When sending a command to read/write a characteristic on a BLE server this adds a new parameter to cause the action to be
performed immediately. This will stop the scan in progress to perform the actions queued.

Example use:
```
mosquitto_pub -t home/OpenMQTTGateway/commands/MQTTtoBT/config -m '{
  "ble_write_address":"AA:BB:CC:DD:EE:FF",
  "ble_write_service":"cba20d00-224d-11e6-9fb8-0002a5d5c51b",
  "ble_write_char":"cba20002-224d-11e6-9fb8-0002a5d5c51b",
  "ble_write_value":"TEST",
  "value_type":"STRING",
  "ttl":4,
  "immediate":true }'
```

Stop BLE processing when immeditate command sent.

* Use a shorter connection timeout.

* Update docs.

* Remove MQTT spam for connection retrys

* Prevent crashing when the normal connection process occurs at the same time as an immediate action.

* Use a semaphore to protect BLE device vector.
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OpenMQTTGateway project goal is to concentrate in one firmware different technologies and protocols, decreasing by the way the number of physical bridges needed, and hiding the different technologies singularity behind a simple & wide spread communication protocol; MQTT.

Documentation

The documentation is here

The reference sheet, with the list of all functions, pinouts is here

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Compatible controllers, saas or software

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Thanks goes to these wonderful people who helped OpenMQTTGateway on Github and to the users contributions into the community.

Support

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