connect to arduino

.gitignore

@@ -1 +1,2 @@
 *build*
+*venv*

host/main.py

@@ -0,0 +1,70 @@
+import bleak as b
+import asyncio
+
+TARGET_NAME = "ArduinoTENG"
+
+TENG_SUUID          = "00010000-9a74-4b30-9361-4a16ec09930f"
+TENG_STATUS_CUUID   = "00010001-9a74-4b30-9361-4a16ec09930f"
+TENG_COMMAND_CUUID  = "00010002-9a74-4b30-9361-4a16ec09930f"
+TENG_READING_CUUID  = "00010003-9a74-4b30-9361-4a16ec09930f"
+
+TENG_COMMANDS = {
+    "NOOP":             int(0).to_bytes(1),
+    "MEASURE_BASELINE": int(1).to_bytes(1),
+}
+TENG_STATUS = ["ERROR", "BUSY", "WAIT_CONNECT", "MEASURING_BASELINE", "READING"]
+
+
+
+def teng_status_callback(characteristic, data):
+    value = int.from_bytes(data, byteorder="big", signed=False)
+    if 0 <= value and value < len(TENG_STATUS):
+        print(f"Status change: {TENG_STATUS[value]}")
+    else:
+        print(f"Status change (invalid): status={value}")
+
+async def main():
+    devices = await b.BleakScanner.discover(return_adv=True)
+    # print(devices)
+    target_device = None
+    for adr, (device, adv_data) in devices.items():
+        if device.name == TARGET_NAME:
+            print(adv_data)
+            target_device = device
+            break
+    if target_device is None:
+        print("ERROR: Could not find target device")
+        return
+    print(f"Found target device: {target_device.name}: {target_device.metadata}, {target_device.details}")
+    print(target_device.name, target_device.details)
+    try:
+        async with b.BleakClient(target_device) as client:
+            for service in client.services:
+                print(f"Service: {service.uuid}: {service.description}")
+                for c in service.characteristics:
+                    print(f"\t{c.uuid}: {c.properties}, {c.descriptors}")
+            teng_status     = client.services.get_characteristic(TENG_STATUS_CUUID)
+            teng_command    = client.services.get_characteristic(TENG_COMMAND_CUUID)
+            teng_reading    = client.services.get_characteristic(TENG_READING_CUUID)
+            client.start_notify(teng_status, teng_status_callback)
+
+            await client.write_gatt_char(teng_command, TENG_COMMANDS["NOOP"])
+            await asyncio.sleep(5)
+            await client.write_gatt_char(teng_command, TENG_COMMANDS["MEASURE_BASELINE"])
+
+            while client.is_connected:
+                data = await client.read_gatt_char(teng_reading)
+
+
+                value = int.from_bytes(data, byteorder="little", signed=False)
+                print(f"Reading: {value}")
+                await asyncio.sleep(0.5)
+    except KeyboardInterrupt:
+        pass
+    except asyncio.exceptions.CancelledError:
+        pass
+    print("Disconnected")
+
+
+if __name__ == "__main__":
+    asyncio.run(main())