# MIT License # # Copyright (c) 2016-2022 Mark Qvist / unsigned.io # # Permission is hereby granted, free of charge, to any person obtaining a copy # of this software and associated documentation files (the "Software"), to deal # in the Software without restriction, including without limitation the rights # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell # copies of the Software, and to permit persons to whom the Software is # furnished to do so, subject to the following conditions: # # The above copyright notice and this permission notice shall be included in all # copies or substantial portions of the Software. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE # SOFTWARE. from .Interface import Interface from time import sleep import sys import threading import time import RNS class HDLC(): # The Serial Interface packetizes data using # simplified HDLC framing, similar to PPP FLAG = 0x7E ESC = 0x7D ESC_MASK = 0x20 @staticmethod def escape(data): data = data.replace(bytes([HDLC.ESC]), bytes([HDLC.ESC, HDLC.ESC^HDLC.ESC_MASK])) data = data.replace(bytes([HDLC.FLAG]), bytes([HDLC.ESC, HDLC.FLAG^HDLC.ESC_MASK])) return data class SerialInterface(Interface): MAX_CHUNK = 32768 DEFAULT_IFAC_SIZE = 8 owner = None port = None speed = None databits = None parity = None stopbits = None serial = None def __init__(self, owner, configuration): import importlib if importlib.util.find_spec('serial') != None: import serial else: RNS.log("Using the Serial interface requires a serial communication module to be installed.", RNS.LOG_CRITICAL) RNS.log("You can install one with the command: python3 -m pip install pyserial", RNS.LOG_CRITICAL) RNS.panic() super().__init__() c = configuration name = c["name"] port = c["port"] if "port" in c else None speed = int(c["speed"]) if "speed" in c else 9600 databits = int(c["databits"]) if "databits" in c else 8 parity = c["parity"] if "parity" in c else "N" stopbits = int(c["stopbits"]) if "stopbits" in c else 1 if port == None: raise ValueError("No port specified for serial interface") self.HW_MTU = 564 self.pyserial = serial self.serial = None self.owner = owner self.name = name self.port = port self.speed = speed self.databits = databits self.parity = serial.PARITY_NONE self.stopbits = stopbits self.timeout = 100 self.online = False self.bitrate = self.speed if parity.lower() == "e" or parity.lower() == "even": self.parity = serial.PARITY_EVEN if parity.lower() == "o" or parity.lower() == "odd": self.parity = serial.PARITY_ODD try: self.open_port() except Exception as e: RNS.log("Could not open serial port for interface "+str(self), RNS.LOG_ERROR) raise e if self.serial.is_open: self.configure_device() else: raise IOError("Could not open serial port") def open_port(self): RNS.log("Opening serial port "+self.port+"...", RNS.LOG_VERBOSE) self.serial = self.pyserial.Serial( port = self.port, baudrate = self.speed, bytesize = self.databits, parity = self.parity, stopbits = self.stopbits, xonxoff = False, rtscts = False, timeout = 0, inter_byte_timeout = None, write_timeout = None, dsrdtr = False, ) def configure_device(self): sleep(0.5) thread = threading.Thread(target=self.readLoop) thread.daemon = True thread.start() self.online = True RNS.log("Serial port "+self.port+" is now open", RNS.LOG_VERBOSE) def processIncoming(self, data): self.rxb += len(data) self.owner.inbound(data, self) def processOutgoing(self,data): if self.online: data = bytes([HDLC.FLAG])+HDLC.escape(data)+bytes([HDLC.FLAG]) written = self.serial.write(data) self.txb += len(data) if written != len(data): raise IOError("Serial interface only wrote "+str(written)+" bytes of "+str(len(data))) def readLoop(self): try: in_frame = False escape = False data_buffer = b"" last_read_ms = int(time.time()*1000) while self.serial.is_open: if self.serial.in_waiting: byte = ord(self.serial.read(1)) last_read_ms = int(time.time()*1000) if (in_frame and byte == HDLC.FLAG): in_frame = False self.processIncoming(data_buffer) elif (byte == HDLC.FLAG): in_frame = True data_buffer = b"" elif (in_frame and len(data_buffer) < self.HW_MTU): if (byte == HDLC.ESC): escape = True else: if (escape): if (byte == HDLC.FLAG ^ HDLC.ESC_MASK): byte = HDLC.FLAG if (byte == HDLC.ESC ^ HDLC.ESC_MASK): byte = HDLC.ESC escape = False data_buffer = data_buffer+bytes([byte]) else: time_since_last = int(time.time()*1000) - last_read_ms if len(data_buffer) > 0 and time_since_last > self.timeout: data_buffer = b"" in_frame = False escape = False sleep(0.08) except Exception as e: self.online = False RNS.log("A serial port error occurred, the contained exception was: "+str(e), RNS.LOG_ERROR) RNS.log("The interface "+str(self)+" experienced an unrecoverable error and is now offline.", RNS.LOG_ERROR) if RNS.Reticulum.panic_on_interface_error: RNS.panic() RNS.log("Reticulum will attempt to reconnect the interface periodically.", RNS.LOG_ERROR) self.online = False self.serial.close() self.reconnect_port() def reconnect_port(self): while not self.online: try: time.sleep(5) RNS.log("Attempting to reconnect serial port "+str(self.port)+" for "+str(self)+"...", RNS.LOG_VERBOSE) self.open_port() if self.serial.is_open: self.configure_device() except Exception as e: RNS.log("Error while reconnecting port, the contained exception was: "+str(e), RNS.LOG_ERROR) RNS.log("Reconnected serial port for "+str(self)) def should_ingress_limit(self): return False def __str__(self): return "SerialInterface["+self.name+"]"