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