add a bluetooth logging script

scripts/log_data.py

@@ -0,0 +1,34 @@
+import asyncio
+import struct
+
+import numpy as np
+from bleak import BleakClient
+from matplotlib import pyplot as plt
+
+address = "65:72:31:D7:E2:12"
+MODEL_NBR_UUID = "2A24"
+
+batt = []
+
+
+async def main(address):
+    async with BleakClient(address) as client:
+        model_number = await client.read_gatt_char(MODEL_NBR_UUID)
+        print("Model Number: {0}".format("".join(map(chr, model_number))))
+        while True:
+            # batt.append(ord(await client.read_gatt_char("2A19")))
+            batt.append(struct.unpack("b", (await client.read_gatt_char("2A19")))[0])
+            print(batt[-1])
+
+
+try:
+    asyncio.run(main(address))
+except KeyboardInterrupt:
+    changed = np.diff(batt) != 0
+    print(
+        f"{np.sum(changed)} changes (seconds) in {len(changed)} samples ({len(changed) / np.sum(changed)} samples per second)"
+    )
+
+    plt.plot(batt)
+    plt.show()
+    plt.show()