New worker: ble devices scanner (#46)

* Worker for ble devices scanning

Added a worker that scan for ble devices and notify, by mqtt, presence of mac addresses and rssi.

Configuration section example:

....
workers:
    blescanmulti:
      args:
        devices:
          nut: xx:xx:xx:xx:xx:xx
          ionic: xx:xx:xx:xx:xx:xx
        topic_prefix: blescan
      update_interval: 60
...

* Update README.md 

blescanmulti worker added

* Update config.yaml.example

Added configuration section for blescanmulti worker

* Converted blescanmulti.py indentation to 2 spaces

* changed mqtt message syntax

* Update README.md

Added contributor repos url

* Update .gitignore

Removed .vscode/

* Delete settings.json

* Changes by pull request review 11/01/2019
 On branch master
	modified:   workers/blescanmulti.py

.gitignore

@@ -1,3 +1,4 @@
 config.yaml
 __pycache__/
 .idea/
+.vscode/

README.md

@@ -21,6 +21,7 @@ See [Wiki](https://github.com/zewelor/bt-mqtt-gateway/wiki) for more information
 * [MySensors](https://www.mysensors.org/)
 * [Xiaomi Mi Flora plant sensor](https://xiaomi-mi.com/sockets-and-sensors/xiaomi-huahuacaocao-flower-care-smart-monitor/) via [miflora](https://github.com/open-homeautomation/miflora)
 * Xiaomi Aqara thermometer via [mithermometer](https://github.com/hobbypunk90/mithermometer)
+* Bluetooth Low Power devices (BLE)
 
 ## Getting Started
 
@@ -104,6 +105,8 @@ You need to define the absolute path of `gateway.py` in `bt-mqtt-gateway.service
 
 * [**zewelor**](https://github.com/zewelor) - *Initial work*
 * [**bbbenji**](https://github.com/bbbenji) - *Minor contributions*
+* [**elviosebastianelli**](https://github.com/elviosebastianelli) - *BLEscanmulti*
+* [**jumping2000**](https://github.com/jumping2000) - *BLEscan*
 
 ## License
 

config.yaml.example

@@ -48,3 +48,10 @@ manager:
           living_room: 00:11:22:33:44:55
         topic_prefix: mithermometer
       update_interval: 300
+    blescanmulti:
+      args:
+        devices:
+          beacon: 00:11:22:33:44:55
+          smartwath: 00:11:22:33:44:55
+        topic_prefix: blescan
+      update_interval: 60

workers/blescanmulti.py

@@ -0,0 +1,39 @@
+import time
+from interruptingcow import timeout
+from bluepy.btle import Scanner, DefaultDelegate
+from mqtt import MqttMessage
+from workers.base import BaseWorker
+from logger import _LOGGER
+
+REQUIREMENTS = ['bluepy']
+
+class ScanDelegate(DefaultDelegate):
+  def __init__(self):
+    DefaultDelegate.__init__(self)
+
+  def handleDiscovery(self, dev, isNewDev, isNewData):
+    if isNewDev:
+      _LOGGER.debug("Discovered new device: %s" % dev.addr)
+
+class BlescanmultiWorker(BaseWorker):
+  def searchmac(self, devices, mac):
+    for dev in devices:
+      if dev.addr == mac.lower():
+         return dev
+
+    return None
+
+  def status_update(self):
+    scanner = Scanner().withDelegate(ScanDelegate())
+    devices = scanner.scan(10.0)
+    ret = []
+
+    for name, mac in self.devices.items():
+      device = self.searchmac(devices, mac)
+      if device is None:
+        ret.append(MqttMessage(topic=self.format_topic('presence/'+name), payload="0"))
+      else:
+        ret.append(MqttMessage(topic=self.format_topic('presence/'+name+'/rssi'), payload=device.rssi))
+        ret.append(MqttMessage(topic=self.format_topic('presence/'+name), payload="1"))
+
+    return ret