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Reticulum/RNS/Interfaces/KISSInterface.py
gretel 3bbd43cc1b Fix KISS beacon frame formatting and add sync pattern 
Two issues were resolved with KISS interface beacon transmissions:

1. Fixed frame length handling to meet minimum length requirements (15 bytes) for
   TNCs like Direwolf. Previously, raw beacon data was being sent directly,
   causing frame length errors:

```
<<< Data frame from KISS client application, channel 0, total length = 11
  000:  c0 00 44 4e 39 54 54 2d 31 35 c0                 ..FOOBAR-15.
Frame length 8 not in allowable range of 15 to 2123.
ERROR - Invalid KISS data frame from client app.
```

2. Added standard 0xAA 0xAA sync pattern to improve radio modem synchronization
   and compatibility with packet radio protocols like FX.25 and IL2P.

This ensures:
- Proper frame length for TNC compatibility
- Better bit synchronization with standard sync pattern
- Improved reception reliability
- Compatible with both KISS TNCs and packet radio protocols

```
<<< Data frame from KISS client application, channel 0, total length = 18
  000:  c0 00 aa aa 44 4e 39 54 54 2d 31 35 00 00 00 00  ....FOOBAR-15....
  010:  00 c0                                            ..
[0L 21:25:43 UTC] (Not AX.25)<0xaa><0xaa>FOOBAR-15<0x00><0x00><0x00><0x00><0x00>
IL2P frame, max_fec = 1, 49 encoded bytes total
  000:  f1 5e 48 87 b8 59 b7 a1 cc 24 57 d6 0b 36 7c f1  .^H..Y...$W..6|.
  010:  7c d5 af 85 db 12 99 80 9d b8 6b bb 6b 05 df 1e  |.........k.k...
  020:  69 0e d8 69 05 f6 ff c4 24 fa 58 f7 e7 f2 a4 df  i..i....$.X.....
  030:  a1                                               .
```
2024-11-19 20:55:16 +01:00

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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 .Interface import Interface
from time import sleep
import sys
import threading
import time
import RNS
class KISS():
FEND = 0xC0
FESC = 0xDB
TFEND = 0xDC
TFESC = 0xDD
CMD_UNKNOWN = 0xFE
CMD_DATA = 0x00
CMD_TXDELAY = 0x01
CMD_P = 0x02
CMD_SLOTTIME = 0x03
CMD_TXTAIL = 0x04
CMD_FULLDUPLEX = 0x05
CMD_SETHARDWARE = 0x06
CMD_READY = 0x0F
CMD_RETURN = 0xFF
@staticmethod
def escape(data):
data = data.replace(bytes([0xdb]), bytes([0xdb, 0xdd]))
data = data.replace(bytes([0xc0]), bytes([0xdb, 0xdc]))
return data
class KISSInterface(Interface):
MAX_CHUNK = 32768
BITRATE_GUESS = 1200
owner = None
port = None
speed = None
databits = None
parity = None
stopbits = None
serial = None
def __init__(self, owner, name, port, speed, databits, parity, stopbits, preamble, txtail, persistence, slottime, flow_control, beacon_interval, beacon_data):
import importlib
if importlib.util.find_spec('serial') != None:
import serial
else:
RNS.log("Using the KISS 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__()
self.HW_MTU = 564
if beacon_data == None:
beacon_data = ""
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.beacon_i = beacon_interval
self.beacon_d = beacon_data.encode("utf-8")
self.first_tx = None
self.bitrate = KISSInterface.BITRATE_GUESS
self.packet_queue = []
self.flow_control = flow_control
self.interface_ready = False
self.flow_control_timeout = 5
self.flow_control_locked = time.time()
self.preamble = preamble if preamble != None else 350;
self.txtail = txtail if txtail != None else 20;
self.persistence = persistence if persistence != None else 64;
self.slottime = slottime if slottime != None else 20;
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 "+self.port, 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):
# Allow time for interface to initialise before config
sleep(2.0)
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("Configuring KISS interface parameters...")
self.setPreamble(self.preamble)
self.setTxTail(self.txtail)
self.setPersistence(self.persistence)
self.setSlotTime(self.slottime)
self.setFlowControl(self.flow_control)
self.interface_ready = True
RNS.log("KISS interface configured")
def setPreamble(self, preamble):
preamble_ms = preamble
preamble = int(preamble_ms / 10)
if preamble < 0:
preamble = 0
if preamble > 255:
preamble = 255
kiss_command = bytes([KISS.FEND])+bytes([KISS.CMD_TXDELAY])+bytes([preamble])+bytes([KISS.FEND])
written = self.serial.write(kiss_command)
if written != len(kiss_command):
raise IOError("Could not configure KISS interface preamble to "+str(preamble_ms)+" (command value "+str(preamble)+")")
def setTxTail(self, txtail):
txtail_ms = txtail
txtail = int(txtail_ms / 10)
if txtail < 0:
txtail = 0
if txtail > 255:
txtail = 255
kiss_command = bytes([KISS.FEND])+bytes([KISS.CMD_TXTAIL])+bytes([txtail])+bytes([KISS.FEND])
written = self.serial.write(kiss_command)
if written != len(kiss_command):
raise IOError("Could not configure KISS interface TX tail to "+str(txtail_ms)+" (command value "+str(txtail)+")")
def setPersistence(self, persistence):
if persistence < 0:
persistence = 0
if persistence > 255:
persistence = 255
kiss_command = bytes([KISS.FEND])+bytes([KISS.CMD_P])+bytes([persistence])+bytes([KISS.FEND])
written = self.serial.write(kiss_command)
if written != len(kiss_command):
raise IOError("Could not configure KISS interface persistence to "+str(persistence))
def setSlotTime(self, slottime):
slottime_ms = slottime
slottime = int(slottime_ms / 10)
if slottime < 0:
slottime = 0
if slottime > 255:
slottime = 255
kiss_command = bytes([KISS.FEND])+bytes([KISS.CMD_SLOTTIME])+bytes([slottime])+bytes([KISS.FEND])
written = self.serial.write(kiss_command)
if written != len(kiss_command):
raise IOError("Could not configure KISS interface slot time to "+str(slottime_ms)+" (command value "+str(slottime)+")")
def setFlowControl(self, flow_control):
kiss_command = bytes([KISS.FEND])+bytes([KISS.CMD_READY])+bytes([0x01])+bytes([KISS.FEND])
written = self.serial.write(kiss_command)
if written != len(kiss_command):
if (flow_control):
raise IOError("Could not enable KISS interface flow control")
else:
raise IOError("Could not enable KISS interface flow control")
def processIncoming(self, data):
self.rxb += len(data)
self.owner.inbound(data, self)
def processOutgoing(self,data):
datalen = len(data)
if self.online:
if self.interface_ready:
if self.flow_control:
self.interface_ready = False
self.flow_control_locked = time.time()
data = data.replace(bytes([0xdb]), bytes([0xdb])+bytes([0xdd]))
data = data.replace(bytes([0xc0]), bytes([0xdb])+bytes([0xdc]))
frame = bytes([KISS.FEND])+bytes([0x00])+data+bytes([KISS.FEND])
written = self.serial.write(frame)
self.txb += datalen
if data == self.beacon_d:
self.first_tx = None
else:
if self.first_tx == None:
self.first_tx = time.time()
if written != len(frame):
raise IOError("Serial interface only wrote "+str(written)+" bytes of "+str(len(data)))
else:
self.queue(data)
def queue(self, data):
self.packet_queue.append(data)
def process_queue(self):
if len(self.packet_queue) > 0:
data = self.packet_queue.pop(0)
self.interface_ready = True
self.processOutgoing(data)
elif len(self.packet_queue) == 0:
self.interface_ready = True
def readLoop(self):
try:
in_frame = False
escape = False
command = KISS.CMD_UNKNOWN
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 == KISS.FEND and command == KISS.CMD_DATA):
in_frame = False
self.processIncoming(data_buffer)
elif (byte == KISS.FEND):
in_frame = True
command = KISS.CMD_UNKNOWN
data_buffer = b""
elif (in_frame and len(data_buffer) < self.HW_MTU):
if (len(data_buffer) == 0 and command == KISS.CMD_UNKNOWN):
# We only support one HDLC port for now, so
# strip off the port nibble
byte = byte & 0x0F
command = byte
elif (command == KISS.CMD_DATA):
if (byte == KISS.FESC):
escape = True
else:
if (escape):
if (byte == KISS.TFEND):
byte = KISS.FEND
if (byte == KISS.TFESC):
byte = KISS.FESC
escape = False
data_buffer = data_buffer+bytes([byte])
elif (command == KISS.CMD_READY):
self.process_queue()
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
command = KISS.CMD_UNKNOWN
escape = False
sleep(0.05)
if self.flow_control:
if not self.interface_ready:
if time.time() > self.flow_control_locked + self.flow_control_timeout:
RNS.log("Interface "+str(self)+" is unlocking flow control due to time-out. This should not happen. Your hardware might have missed a flow-control READY command, or maybe it does not support flow-control.", RNS.LOG_WARNING)
self.process_queue()
if self.beacon_i != None and self.beacon_d != None:
if self.first_tx != None:
if time.time() > self.first_tx + self.beacon_i:
RNS.log("Interface "+str(self)+" is transmitting beacon data: "+str(self.beacon_d.decode("utf-8")), RNS.LOG_DEBUG)
self.first_tx = None
# Using standard HDLC flag or sync bytes
frame = bytearray([0xAA, 0xAA]) # Standard sync pattern
frame.extend(self.beacon_d)
while len(frame) < 15:
frame.append(0x00)
self.processOutgoing(bytes(frame))
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 "KISSInterface["+self.name+"]"
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