Files
Akita-Meshtastic-Meshcore-B…/ammb/meshcore_handler.py
2025-11-18 19:31:55 -05:00

261 lines
12 KiB
Python

# ammb/meshcore_handler.py
"""
Handles interactions with an external device via a **Serial** port.
"""
import logging
import threading
import time
import json
from queue import Queue, Empty, Full
from typing import Optional, Dict, Any
import serial
from .config_handler import BridgeConfig
from .protocol import MeshcoreProtocolHandler, get_serial_protocol_handler
class MeshcoreHandler:
"""Manages Serial connection and communication with an external device."""
RECONNECT_DELAY_S = 10
def __init__(self, config: BridgeConfig, to_meshtastic_queue: Queue, from_meshtastic_queue: Queue, shutdown_event: threading.Event):
self.logger = logging.getLogger(__name__)
self.config = config
self.to_meshtastic_queue = to_meshtastic_queue
self.to_serial_queue = from_meshtastic_queue
self.shutdown_event = shutdown_event
self.serial_port: Optional[serial.Serial] = None
self.receiver_thread: Optional[threading.Thread] = None
self.sender_thread: Optional[threading.Thread] = None
self._lock = threading.Lock()
self._is_connected = threading.Event()
if not config.serial_port or not config.serial_baud or not config.serial_protocol:
raise ValueError("Serial transport selected, but required SERIAL configuration options are missing.")
try:
self.protocol_handler: MeshcoreProtocolHandler = get_serial_protocol_handler(config.serial_protocol)
except ValueError as e:
self.logger.critical(f"Failed to initialize serial protocol handler '{config.serial_protocol}': {e}.")
class DummyHandler(MeshcoreProtocolHandler):
def read(self, port): return None
def encode(self, data): return None
def decode(self, line): return None
self.protocol_handler = DummyHandler()
self.logger.info("Serial Handler (MeshcoreHandler) Initialized.")
def connect(self) -> bool:
with self._lock:
if self.serial_port and self.serial_port.is_open:
self.logger.info(f"Serial port {self.config.serial_port} already connected.")
self._is_connected.set()
return True
try:
self.logger.info(f"Attempting connection to Serial device on {self.config.serial_port} at {self.config.serial_baud} baud...")
self._is_connected.clear()
if self.serial_port:
try:
self.serial_port.close()
except Exception: pass
self.serial_port = serial.Serial(
port=self.config.serial_port,
baudrate=self.config.serial_baud,
timeout=1,
)
if self.serial_port.is_open:
self.logger.info(f"Connected to Serial device on {self.config.serial_port}")
self._is_connected.set()
return True
else:
self.logger.error(f"Failed to open serial port {self.config.serial_port}, but no exception was raised.")
self.serial_port = None
self._is_connected.clear()
return False
except serial.SerialException as e:
self.logger.error(f"Serial error connecting to device {self.config.serial_port}: {e}")
self.serial_port = None
self._is_connected.clear()
return False
except Exception as e:
self.logger.error(f"Unexpected error connecting to serial device: {e}", exc_info=True)
self.serial_port = None
self._is_connected.clear()
return False
def start_threads(self):
if self.receiver_thread and self.receiver_thread.is_alive():
self.logger.warning("Serial receiver thread already started.")
else:
self.logger.info("Starting Serial receiver thread...")
self.receiver_thread = threading.Thread(target=self._serial_receiver_loop, daemon=True, name="SerialReceiver")
self.receiver_thread.start()
if self.sender_thread and self.sender_thread.is_alive():
self.logger.warning("Serial sender thread already started.")
else:
self.logger.info("Starting Serial sender thread...")
self.sender_thread = threading.Thread(target=self._serial_sender_loop, daemon=True, name="SerialSender")
self.sender_thread.start()
def stop(self):
self.logger.info("Stopping Serial handler...")
if self.receiver_thread and self.receiver_thread.is_alive():
self.receiver_thread.join(timeout=2)
if self.sender_thread and self.sender_thread.is_alive():
self.sender_thread.join(timeout=5)
self._close_serial()
self.logger.info("Serial handler stopped.")
def _close_serial(self):
with self._lock:
if self.serial_port and self.serial_port.is_open:
port_name = self.config.serial_port
try:
self.serial_port.close()
self.logger.info(f"Serial port {port_name} closed.")
except Exception as e:
self.logger.error(f"Error closing serial port {port_name}: {e}", exc_info=True)
finally:
self.serial_port = None
self._is_connected.clear()
def _serial_receiver_loop(self):
"""Continuously reads from serial using Protocol Handler, translates, and queues."""
self.logger.info("Serial receiver loop started.")
while not self.shutdown_event.is_set():
# --- Connection Check ---
if not self._is_connected.is_set():
self.logger.warning(f"Serial port {self.config.serial_port} not connected. Attempting reconnect...")
if self.connect():
self.logger.info(f"Serial device reconnected successfully on {self.config.serial_port}.")
else:
self.shutdown_event.wait(self.RECONNECT_DELAY_S)
continue
# --- Read and Process Data ---
try:
raw_data: Optional[bytes] = None
with self._lock:
if self.serial_port and self.serial_port.is_open:
# Delegate reading to protocol handler
raw_data = self.protocol_handler.read(self.serial_port)
else:
self._is_connected.clear()
continue
if raw_data:
self.logger.debug(f"Serial RAW RX: {raw_data!r}")
# Decode using the selected protocol handler
decoded_msg: Optional[Dict[str, Any]] = self.protocol_handler.decode(raw_data)
if decoded_msg:
# Basic Translation Logic (Serial -> Meshtastic)
dest_meshtastic_id = decoded_msg.get("destination_meshtastic_id")
payload = decoded_msg.get("payload")
payload_json = decoded_msg.get("payload_json")
channel_index = decoded_msg.get("channel_index", 0)
want_ack = decoded_msg.get("want_ack", False)
text_payload_str: Optional[str] = None
if isinstance(payload, str):
text_payload_str = payload
elif payload_json is not None:
try:
text_payload_str = json.dumps(payload_json)
except (TypeError, ValueError) as e:
self.logger.error(f"Failed to serialize payload_json: {e}")
elif payload is not None:
text_payload_str = str(payload)
if dest_meshtastic_id and text_payload_str is not None:
meshtastic_msg = {
"destination": dest_meshtastic_id,
"text": text_payload_str,
"channel_index": channel_index,
"want_ack": want_ack,
}
try:
self.to_meshtastic_queue.put_nowait(meshtastic_msg)
self.logger.info(f"Queued message from Serial for Meshtastic node {dest_meshtastic_id}")
except Full:
self.logger.warning("Meshtastic send queue is full. Dropping incoming message from Serial.")
else:
self.logger.warning(f"Serial RX: Decoded message lacks required fields: {decoded_msg}")
else:
# No data available from serial, sleep briefly to prevent CPU spin
time.sleep(0.1)
except serial.SerialException as e:
self.logger.error(f"Serial error in receiver loop ({self.config.serial_port}): {e}. Attempting to reconnect...")
self._close_serial()
time.sleep(1)
except Exception as e:
self.logger.error(f"Unexpected error in serial_receiver_loop: {e}", exc_info=True)
self._close_serial()
time.sleep(self.RECONNECT_DELAY_S / 2)
self.logger.info("Serial receiver loop stopped.")
def _serial_sender_loop(self):
"""Continuously reads from the queue, encodes, and sends messages via Serial."""
self.logger.info("Serial sender loop started.")
while not self.shutdown_event.is_set():
if not self._is_connected.is_set():
time.sleep(self.RECONNECT_DELAY_S / 2)
continue
try:
item: Optional[Dict[str, Any]] = self.to_serial_queue.get(timeout=1)
if not item:
continue
encoded_message: Optional[bytes] = self.protocol_handler.encode(item)
if encoded_message:
# Truncate log for binary safety
log_preview = repr(encoded_message[:50])
self.logger.info(f"Serial TX -> Port: {self.config.serial_port}, Payload: {log_preview}")
send_success = False
with self._lock:
if self.serial_port and self.serial_port.is_open:
try:
self.serial_port.write(encoded_message)
self.serial_port.flush()
send_success = True
except serial.SerialException as e:
self.logger.error(f"Serial error during send ({self.config.serial_port}): {e}.")
self._close_serial()
except Exception as e:
self.logger.error(f"Unexpected error sending Serial message: {e}", exc_info=True)
else:
self.logger.warning(f"Serial port disconnected just before send attempt.")
self._is_connected.clear()
if send_success:
self.to_serial_queue.task_done()
else:
self.logger.error("Failed to send Serial message. Discarding.")
self.to_serial_queue.task_done()
else:
self.logger.error(f"Failed to encode message for Serial: {item}")
self.to_serial_queue.task_done()
except Empty:
continue
except Exception as e:
self.logger.error(f"Critical error in serial_sender_loop: {e}", exc_info=True)
self._is_connected.clear()
time.sleep(5)
self.logger.info("Serial sender loop stopped.")