commit d4efac8f13633bbbcfbb60c37b1b7774c6544130
Author: Knut Ahlers <knut@ahlers.me>
Date:   Sun Oct 17 01:32:42 2021 +0200

    Initial version

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..4c49bd7
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+.env
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..e4a5da1
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,10 @@
+default:
+
+run:
+	vault2env -k secret/private/mqttcli -- envrun -- ./.venv/bin/python main.py
+
+requirements: .venv
+	./.venv/bin/pip install -r requirements.txt
+
+.venv:
+	python -m venv .venv
diff --git a/main.py b/main.py
new file mode 100644
index 0000000..a5cfcc6
--- /dev/null
+++ b/main.py
@@ -0,0 +1,150 @@
+import logging
+import os
+import sys
+
+from bluepy import btle
+from bluepy.btle import AssignedNumbers, BTLEDisconnectError
+import paho.mqtt.client as mqtt
+
+
+class TransformDelegate(btle.DefaultDelegate):
+    def __init__(self, handle, callback, transform):
+        btle.DefaultDelegate.__init__(self)
+        self.handle = handle
+        self.callback = callback
+        self.transform = transform
+
+    def handleNotification(self, cHandle, data):
+        if cHandle != self.handle:
+            return
+
+        self.callback(self.transform(data))
+
+
+class StreamPulse:
+    def __init__(self, **kwargs):
+        self.address = kwargs['address']
+        self.topic_prefix = kwargs['mqtt_prefix'] if 'mqtt_prefix' in kwargs else 'streampulse'
+
+        if 'mqtt_host' in kwargs and kwargs['mqtt_host'] != '':
+            self.mqtt = mqtt.Client()
+            if 'mqtt_user' in kwargs:
+                self.mqtt.username_pw_set(
+                    kwargs['mqtt_user'],
+                    kwargs['mqtt_pass'],
+                )
+            self.mqtt.connect(
+                kwargs['mqtt_host'],
+                kwargs['mqtt_port'] if 'mqtt_port' in kwargs else 1883,
+            )
+        else:
+            self.mqtt = None
+
+    def run(self):
+        if self.mqtt is not None:
+            self.mqtt.loop_start()
+
+        while True:
+            dev = None
+
+            try:
+                logging.debug("Connecting...")
+                dev = btle.Peripheral(self.address)
+                self.send_mqtt('connected', 'true', True)
+
+                self.add_subscription(
+                    dev,
+                    AssignedNumbers.batteryService,
+                    AssignedNumbers.batteryLevel,
+                    self.handle_battery,
+                    lambda data: int(data[0]),
+                    True,
+                )
+
+                self.add_subscription(
+                    dev,
+                    AssignedNumbers.heartRate,
+                    AssignedNumbers.heart_rate_measurement,
+                    self.handle_heart_rate,
+                    lambda data: int(data[1]),
+                    False,
+                )
+
+                while True:
+                    if dev.waitForNotifications(1.0):
+                        continue
+
+            except BTLEDisconnectError:
+                logging.error("Device connection error")
+
+            except KeyboardInterrupt:
+                if dev is not None:
+                    dev.disconnect()
+                break
+
+            finally:
+                self.send_mqtt('connected', 'false', True)
+                if dev is not None:
+                    dev.disconnect()
+
+        if self.mqtt is not None:
+            self.mqtt.loop_stop()
+        return 0
+
+    def add_subscription(self, dev, svc_uuid, char_uuid, callback, transform, initial_read=False):
+        svc = dev.getServiceByUUID(svc_uuid)
+        char = svc.getCharacteristics(char_uuid)[0]
+        desc = char.getDescriptors(
+            AssignedNumbers.client_characteristic_configuration,
+        )
+
+        dev.setDelegate(TransformDelegate(
+            char.getHandle(),
+            callback,
+            transform,
+        ))
+        dev.writeCharacteristic(desc[0].handle, b"\x01\x00")
+
+        if initial_read:
+            callback(transform(char.read()))
+
+    def get_full_topic(self, topic):
+        return '/'.join([self.topic_prefix, topic])
+
+    def handle_battery(self, level):
+        logging.debug("Battery Level: {}".format(level))
+        self.send_mqtt('battery', level, True)
+
+    def handle_heart_rate(self, rate):
+        logging.debug("Heart Rate: {}".format(rate))
+        self.send_mqtt('heart_rate', rate, False)
+
+    def send_mqtt(self, topic, payload, retain=False):
+        if self.mqtt is None:
+            return
+
+        self.mqtt.publish(
+            self.get_full_topic(topic),
+            payload=payload,
+            qos=1,
+            retain=retain,
+        )
+
+
+if __name__ == '__main__':
+    logging.basicConfig(
+        format='[%(asctime)s][%(levelname)s] %(message)s',
+        level=logging.DEBUG,
+    )
+
+    pulse = StreamPulse(
+        address=os.environ['DEVICE'] if 'DEVICE' in os.environ else 'a0:9e:1a:70:54:5e',
+        mqtt_host=os.environ['MQTT_HOST'] if 'MQTT_HOST' in os.environ else '',
+        mqtt_pass=os.environ['MQTT_PASS'] if 'MQTT_PASS' in os.environ else '',
+        mqtt_port=int(os.environ['MQTT_PORT']
+                      ) if 'MQTT_PORT' in os.environ else 1883,
+        mqtt_prefix=os.environ['MQTT_PREFIX'] if 'MQTT_PREFIX' in os.environ else 'streampulse',
+        mqtt_user=os.environ['MQTT_USER'] if 'MQTT_USER' in os.environ else '',
+    )
+
+    sys.exit(pulse.run())
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..9849e3f
--- /dev/null
+++ b/requirements.txt
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+bluepy==1.3.0
+paho-mqtt==1.5.1