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Reticulum/RNS/Interfaces/Android/SerialInterface.py

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# 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 RNS.Interfaces.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
owner = None
port = None
speed = None
databits = None
parity = None
stopbits = None
serial = None
def __init__(self, owner, name, port, speed, databits, parity, stopbits):
import importlib
if RNS.vendor.platformutils.is_android():
self.on_android = True
if importlib.util.find_spec('usbserial4a') != None:
if importlib.util.find_spec('jnius') == None:
RNS.log("Could not load jnius API wrapper for Android, Serial interface cannot be created.", RNS.LOG_CRITICAL)
RNS.log("This probably means you are trying to use an USB-based interface from within Termux or similar.", RNS.LOG_CRITICAL)
RNS.log("This is currently not possible, due to this environment limiting access to the native Android APIs.", RNS.LOG_CRITICAL)
RNS.panic()
from usbserial4a import serial4a as serial
self.parity = "N"
else:
RNS.log("Could not load USB serial module for Android, Serial interface cannot be created.", RNS.LOG_CRITICAL)
RNS.log("You can install this module by issuing: pip install usbserial4a", RNS.LOG_CRITICAL)
RNS.panic()
else:
raise SystemError("Android-specific interface was used on non-Android OS")
self.rxb = 0
self.txb = 0
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 = "N"
self.stopbits = stopbits
self.timeout = 100
self.online = False
self.bitrate = self.speed
if parity.lower() == "e" or parity.lower() == "even":
self.parity = "E"
if parity.lower() == "o" or parity.lower() == "odd":
self.parity = "O"
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+"...")
# Get device parameters
from usb4a import usb
device = usb.get_usb_device(self.port)
if device:
vid = device.getVendorId()
pid = device.getProductId()
# Driver overrides for speficic chips
proxy = self.pyserial.get_serial_port
if vid == 0x1A86 and pid == 0x55D4:
# Force CDC driver for Qinheng CH34x
RNS.log(str(self)+" using CDC driver for "+RNS.hexrep(vid)+":"+RNS.hexrep(pid), RNS.LOG_DEBUG)
from usbserial4a.cdcacmserial4a import CdcAcmSerial
proxy = CdcAcmSerial
self.serial = proxy(
self.port,
baudrate = self.speed,
bytesize = self.databits,
parity = self.parity,
stopbits = self.stopbits,
xonxoff = False,
rtscts = False,
timeout = None,
inter_byte_timeout = None,
# write_timeout = wtimeout,
dsrdtr = False,
)
if vid == 0x0403:
# Hardware parameters for FTDI devices @ 115200 baud
self.serial.DEFAULT_READ_BUFFER_SIZE = 16 * 1024
self.serial.USB_READ_TIMEOUT_MILLIS = 100
self.serial.timeout = 0.1
elif vid == 0x10C4:
# Hardware parameters for SiLabs CP210x @ 115200 baud
self.serial.DEFAULT_READ_BUFFER_SIZE = 64
self.serial.USB_READ_TIMEOUT_MILLIS = 12
self.serial.timeout = 0.012
elif vid == 0x1A86 and pid == 0x55D4:
# Hardware parameters for Qinheng CH34x @ 115200 baud
self.serial.DEFAULT_READ_BUFFER_SIZE = 64
self.serial.USB_READ_TIMEOUT_MILLIS = 12
self.serial.timeout = 0.1
else:
# Default values
self.serial.DEFAULT_READ_BUFFER_SIZE = 1 * 1024
self.serial.USB_READ_TIMEOUT_MILLIS = 100
self.serial.timeout = 0.1
RNS.log(str(self)+" USB read buffer size set to "+RNS.prettysize(self.serial.DEFAULT_READ_BUFFER_SIZE), RNS.LOG_DEBUG)
RNS.log(str(self)+" USB read timeout set to "+str(self.serial.USB_READ_TIMEOUT_MILLIS)+"ms", RNS.LOG_DEBUG)
RNS.log(str(self)+" USB write timeout set to "+str(self.serial.USB_WRITE_TIMEOUT_MILLIS)+"ms", RNS.LOG_DEBUG)
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)
def af():
self.owner.inbound(data, self)
threading.Thread(target=af, daemon=True).start()
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:
serial_bytes = self.serial.read()
got = len(serial_bytes)
for byte in serial_bytes:
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])
if got == 0:
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 __str__(self):
return "SerialInterface["+self.name+"]"
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