Pool sensor v2: VCC monitoring, database resilience, receiver improvements

- Added voltage monitoring table and storage pipeline
- Extended pool payload to 17 bytes with VCC field (protocol v2)
- Improved database connection pool resilience (reduced pool size, aggressive recycling, pool disposal on failure)
- Added environment variable support for database configuration
- Fixed receiver MQTT deprecation warning (CallbackAPIVersion.VERSION2)
- Silenced excessive RSSI status logging in receiver
- Added reset flag tracking and reporting
- Updated Docker compose with DB config and log rotation limits

test_pool_decode.py

@@ -8,6 +8,12 @@ from typing import Optional, Tuple, Dict
 PAYLOAD_SIZE = 15
 MAGIC1 = 0x42
 MAGIC2 = 0x99
+RESET_FLAG_MAP = [
+    (0x1, "PORF (power-on)"),
+    (0x2, "EXTRF (external reset)"),
+    (0x4, "BORF (brown-out)"),
+    (0x8, "WDRF (watchdog)"),
+]
 
 
 def crc8_xor(data: bytes) -> int:
@@ -18,6 +24,13 @@ def crc8_xor(data: bytes) -> int:
     return c
 
 
+def parse_version_and_reset_flags(version_byte: int):
+    protocol_version = version_byte & 0x0F
+    reset_flags = (version_byte >> 4) & 0x0F
+    reset_causes = [desc for bit, desc in RESET_FLAG_MAP if reset_flags & bit]
+    return protocol_version, reset_flags, reset_causes
+
+
 def decode_pool_payload(candidate_bytes: bytes, expected_seq: Optional[int] = None):
     """Scan a byte stream for a plausible pool payload.
 
@@ -34,7 +47,7 @@ def decode_pool_payload(candidate_bytes: bytes, expected_seq: Optional[int] = No
     for offset in range(0, len(candidate_bytes) - PAYLOAD_SIZE + 1):
         chunk = candidate_bytes[offset:offset + PAYLOAD_SIZE]
         try:
-            magic1, magic2, version, nodeId, seq, t_ds10, t_bme10, hum10, pres1, crc_received = struct.unpack(
+            magic1, magic2, version_byte, nodeId, seq, t_ds10, t_bme10, hum10, pres1, crc_received = struct.unpack(
                 '<BBBBHhhHHB', chunk
             )
         except struct.error:
@@ -44,7 +57,9 @@ def decode_pool_payload(candidate_bytes: bytes, expected_seq: Optional[int] = No
         if crc_calculated != crc_received:
             continue
 
-        if version != 1 or nodeId != 1:
+        protocol_version, reset_flags, reset_causes = parse_version_and_reset_flags(version_byte)
+
+        if protocol_version != 1 or nodeId != 1:
             continue
 
         # Plausibility checks (unit scaled)
@@ -70,7 +85,10 @@ def decode_pool_payload(candidate_bytes: bytes, expected_seq: Optional[int] = No
             best = {
                 "offset": offset,
                 "magic_ok": magic1 == MAGIC1 and magic2 == MAGIC2,
-                "version": version,
+                "version": protocol_version,
+                "version_byte": version_byte,
+                "reset_flags": reset_flags,
+                "reset_causes": reset_causes,
                 "nodeId": nodeId,
                 "sequence": seq,
                 "t_ds_c": t_ds10 / 10.0,
@@ -83,9 +101,10 @@ def decode_pool_payload(candidate_bytes: bytes, expected_seq: Optional[int] = No
     return best
 
 
-def build_payload(seq: int, t_ds10: int, t_bme10: int, hum10: int, pres1: int) -> bytes:
+def build_payload(seq: int, t_ds10: int, t_bme10: int, hum10: int, pres1: int, reset_flags: int = 0) -> bytes:
     """Build a valid payload with CRC appended."""
-    header = struct.pack('<BBBBHhhHH', MAGIC1, MAGIC2, 1, 1, seq, t_ds10, t_bme10, hum10, pres1)
+    version_byte = ((reset_flags & 0x0F) << 4) | 0x01
+    header = struct.pack('<BBBBHhhHH', MAGIC1, MAGIC2, version_byte, 1, seq, t_ds10, t_bme10, hum10, pres1)
     crc = crc8_xor(header)
     return header + bytes([crc])