Changes

soundmeter_log.py

@@ -30,14 +30,16 @@ IMX8_IP = "10.32.34.103"
 IMX8_URL = f"http://{IMX8_IP}:5000"
 
 BLE_MAC  = "B0:D2:78:5C:20:07"
-BLE_CHAR = "0000fff2-0000-1000-8000-00805f9b34fb"
+BLE_CHAR      = "0000fff2-0000-1000-8000-00805f9b34fb"
+BLE_WAKE_CHAR = "0000fff1-0000-1000-8000-00805f9b34fb"
+BLE_WAKE_CMD  = bytes([0xD5, 0xFC, 0x11, 0x0D])  # from Meterbox logcat
 
 # ── Test sequence — edit as required ─────────────────────────────────────────
 _FREQS = [100, 250, 500, 1000, 2000, 3000, 4000, 5000, 6000, 7000,
           8000, 9000, 10000, 11000, 12000, 13000, 14000, 15000]
 
 TEST_STEPS = [
-    {"freq": freq, "vol": round(vol / 10, 1), "duration": 5.0}
+    {"freq": freq, "vol": round(vol / 10, 1), "duration": 10.0}
     for freq in _FREQS
     for vol in range(0, 11)   # 0% → 100% in 10% steps
 ]
@@ -76,11 +78,26 @@ def _http_stop() -> dict:
 # ── Main test runner ──────────────────────────────────────────────────────────
 async def run_test():
     readings: list[float] = []
+    _buf = bytearray()
 
     def on_notify(_sender, data: bytearray):
-        db = _parse_db(data)
-        if db is not None:
-            readings.append(db)
+        nonlocal _buf
+        _buf.extend(data)
+        # reassemble: packets are always 11 bytes starting with D5 F0
+        while len(_buf) >= 11:
+            idx = bytes(_buf).find(b'\xd5\xf0')
+            if idx == -1:
+                _buf.clear()
+                break
+            if idx > 0:
+                del _buf[:idx]        # discard garbage before header
+            if len(_buf) < 11:
+                break
+            packet = bytes(_buf[:11])
+            del _buf[:11]
+            db = _parse_db(packet)
+            if db is not None:
+                readings.append(db)
 
     print(f"Connecting to BLE {BLE_MAC} …")
     async with BleakClient(BLE_MAC, timeout=15.0) as client:
@@ -91,8 +108,12 @@ async def run_test():
                 props = ','.join(ch.properties)
                 print(f"    CHAR {ch.uuid}  [{props}]")
 
+        # Wake-up sequence: write D5 FC 11 0D before subscribing (from Meterbox logcat)
+        await client.write_gatt_char(BLE_WAKE_CHAR, BLE_WAKE_CMD, response=True)
+        print(f"Wake-up sent: {BLE_WAKE_CMD.hex(' ')}")
+
         await client.start_notify(BLE_CHAR, on_notify)
-        print(f"\nSubscribed to {BLE_CHAR}\n")
+        print(f"Subscribed to {BLE_CHAR}\n")
 
         with CSV_FILE.open('w', newline='') as f:
             writer = csv.writer(f)