Add xiaomi scale + dynamic requirements support

workers/miscale.py

@@ -0,0 +1,50 @@
+import time
+
+REQUIREMENTS = ['bluepy', 'interruptingcow']
+
+class MiscaleWorker():
+  def __init__(self, mac):
+    self._mac = mac
+
+  def status_update(self):
+    return [{
+      'topic': 'weight/kg',
+      'payload': self._get_weight(),
+    }]
+
+
+  def _get_weight(self):
+    from bluepy import btle
+    from interruptingcow import timeout
+
+    scan_processor = ScanProcessor(self._mac)
+    scanner = btle.Scanner().withDelegate(scan_processor)
+    scanner.scan(5, passive=True)
+
+    with timeout(5):
+      while scan_processor.weight is None:
+        time.sleep(1)
+      return scan_processor.weight
+
+    return -1
+
+class ScanProcessor():
+  def __init__(self, mac):
+    self._mac = mac
+    self._weight = None
+
+  def handleDiscovery(self, dev, isNewDev, _):
+    if dev.addr == self.mac.lower() and isNewDev:
+      for (sdid, desc, data) in dev.getScanData():
+        if data.startswith('1d18') and sdid == 22:
+          measured = int((data[8:10] + data[6:8]), 16) * 0.01
+
+          self._weight = round(measured / 2, 2)
+
+  @property
+  def mac(self):
+    return self._mac
+
+  @property
+  def weight(self):
+    return self._weight