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Reticulum/RNS/Interfaces/RNodeInterface.py
Mark Qvist 07814919f2 Implemented AX.25 KISS interface
2018-04-08 12:26:57 +02:00

384 lines
12 KiB
Python
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from __future__ import print_function
from Interface import Interface
from time import sleep
import sys
import serial
import threading
import time
import math
import RNS
class KISS():
FEND = chr(0xC0)
FESC = chr(0xDB)
TFEND = chr(0xDC)
TFESC = chr(0xDD)
CMD_UNKNOWN = chr(0xFE)
CMD_DATA = chr(0x00)
CMD_FREQUENCY = chr(0x01)
CMD_BANDWIDTH = chr(0x02)
CMD_TXPOWER = chr(0x03)
CMD_SF = chr(0x04)
CMD_RADIO_STATE = chr(0x05)
CMD_RADIO_LOCK = chr(0x06)
CMD_STAT_RX = chr(0x21)
CMD_STAT_TX = chr(0x22)
CMD_STAT_RSSI = chr(0x23)
CMD_BLINK = chr(0x30)
CMD_RANDOM = chr(0x40)
RADIO_STATE_OFF = chr(0x00)
RADIO_STATE_ON = chr(0x01)
RADIO_STATE_ASK = chr(0xFF)
CMD_ERROR = chr(0x90)
ERROR_INITRADIO = chr(0x01)
ERROR_TXFAILED = chr(0x02)
@staticmethod
def escape(data):
data = data.replace(chr(0xdb), chr(0xdb)+chr(0xdd))
data = data.replace(chr(0xc0), chr(0xdb)+chr(0xdc))
return data
class RNodeInterface(Interface):
MAX_CHUNK = 32768
owner = None
port = None
speed = None
databits = None
parity = None
stopbits = None
serial = None
FREQ_MIN = 137000000
FREQ_MAX = 1020000000
def __init__(self, owner, name, port, frequency = None, bandwidth = None, txpower = None, sf = None):
self.serial = None
self.owner = owner
self.name = name
self.port = port
self.speed = 115200
self.databits = 8
self.parity = serial.PARITY_NONE
self.stopbits = 1
self.timeout = 100
self.online = False
self.frequency = frequency
self.bandwidth = bandwidth
self.txpower = txpower
self.sf = sf
self.cr = 5 # Coding rate is hard-coded in firmware for now
self.state = KISS.RADIO_STATE_OFF
self.bitrate = 0
self.r_frequency = None
self.r_bandwidth = None
self.r_txpower = None
self.r_sf = None
self.r_state = None
self.r_lock = None
self.r_stat_rx = None
self.r_stat_tx = None
self.r_stat_rssi = None
self.r_random = None
self.validcfg = True
if (self.frequency < RNodeInterface.FREQ_MIN or self.frequency > RNodeInterface.FREQ_MAX):
RNS.log("Invalid frequency configured for "+str(self), RNS.LOG_ERROR)
self.validcfg = False
if (self.txpower < 0 or self.txpower > 17):
RNS.log("Invalid TX power configured for "+str(self), RNS.LOG_ERROR)
self.validcfg = False
if (self.bandwidth < 7800 or self.bandwidth > 500000):
RNS.log("Invalid bandwidth configured for "+str(self), RNS.LOG_ERROR)
self.validcfg = False
if (self.sf < 7 or self.sf > 12):
RNS.log("Invalid spreading factor configured for "+str(self), RNS.LOG_ERROR)
self.validcfg = False
if (not self.validcfg):
raise ValueError("The configuration for "+str(self)+" contains errors, interface is offline")
try:
RNS.log("Opening serial port "+self.port+"...")
self.serial = serial.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,
)
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:
sleep(2.0)
thread = threading.Thread(target=self.readLoop)
thread.setDaemon(True)
thread.start()
self.online = True
RNS.log("Serial port "+self.port+" is now open")
RNS.log("Configuring RNode interface...", RNS.LOG_VERBOSE)
self.initRadio()
if (self.validateRadioState()):
RNS.log(str(self)+" is configured and powered up")
else:
RNS.log("After configuring "+str(self)+", the actual radio parameters did not match your configuration.", RNS.LOG_ERROR)
RNS.log("Make sure that your hardware actually supports the parameters specified in the configuration", RNS.LOG_ERROR)
RNS.log("Aborting RNode startup", RNS.LOG_ERROR)
self.serial.close()
raise IOError("RNode interface did not pass validation")
else:
raise IOError("Could not open serial port")
def initRadio(self):
self.setFrequency()
self.setBandwidth()
self.setTXPower()
self.setSpreadingFactor()
self.setRadioState(KISS.RADIO_STATE_ON)
def setFrequency(self):
c1 = self.frequency >> 24
c2 = self.frequency >> 16 & 0xFF
c3 = self.frequency >> 8 & 0xFF
c4 = self.frequency & 0xFF
data = KISS.escape(chr(c1)+chr(c2)+chr(c3)+chr(c4))
kiss_command = KISS.FEND+KISS.CMD_FREQUENCY+data+KISS.FEND
written = self.serial.write(kiss_command)
if written != len(kiss_command):
raise IOError("An IO error occurred while configuring frequency for "+self(str))
def setBandwidth(self):
c1 = self.bandwidth >> 24
c2 = self.bandwidth >> 16 & 0xFF
c3 = self.bandwidth >> 8 & 0xFF
c4 = self.bandwidth & 0xFF
data = KISS.escape(chr(c1)+chr(c2)+chr(c3)+chr(c4))
kiss_command = KISS.FEND+KISS.CMD_BANDWIDTH+data+KISS.FEND
written = self.serial.write(kiss_command)
if written != len(kiss_command):
raise IOError("An IO error occurred while configuring bandwidth for "+self(str))
def setTXPower(self):
txp = chr(self.txpower)
kiss_command = KISS.FEND+KISS.CMD_TXPOWER+txp+KISS.FEND
written = self.serial.write(kiss_command)
if written != len(kiss_command):
raise IOError("An IO error occurred while configuring TX power for "+self(str))
def setSpreadingFactor(self):
sf = chr(self.sf)
kiss_command = KISS.FEND+KISS.CMD_SF+sf+KISS.FEND
written = self.serial.write(kiss_command)
if written != len(kiss_command):
raise IOError("An IO error occurred while configuring spreading factor for "+self(str))
def setRadioState(self, state):
kiss_command = KISS.FEND+KISS.CMD_RADIO_STATE+state+KISS.FEND
written = self.serial.write(kiss_command)
if written != len(kiss_command):
raise IOError("An IO error occurred while configuring radio state for "+self(str))
def validateRadioState(self):
RNS.log("Validating radio configuration for "+str(self)+"...", RNS.LOG_VERBOSE)
sleep(0.25);
if (self.frequency != self.r_frequency):
RNS.log("Frequency mismatch", RNS.LOG_ERROR)
self.validcfg = False
if (self.bandwidth != self.r_bandwidth):
RNS.log("Bandwidth mismatch", RNS.LOG_ERROR)
self.validcfg = False
if (self.txpower != self.r_txpower):
RNS.log("TX power mismatch", RNS.LOG_ERROR)
self.validcfg = False
if (self.sf != self.r_sf):
RNS.log("Spreading factor mismatch", RNS.LOG_ERROR)
self.validcfg = False
if (self.validcfg):
return True
else:
return False
def updateBitrate(self):
try:
self.bitrate = self.r_sf * ( (4.0/self.cr) / (math.pow(2,self.r_sf)/(self.r_bandwidth/1000)) ) * 1000
self.bitrate_kbps = round(self.bitrate/1000.0, 2)
RNS.log(str(self)+" On-air bitrate is now "+str(self.bitrate_kbps)+ " kbps", RNS.LOG_DEBUG)
except:
self.bitrate = 0
def processIncoming(self, data):
self.owner.inbound(data, self)
def processOutgoing(self,data):
if self.online:
data = KISS.escape(data)
frame = chr(0xc0)+chr(0x00)+data+chr(0xc0)
written = self.serial.write(frame)
if written != len(frame):
raise IOError("Serial interface only wrote "+str(written)+" bytes of "+str(len(data)))
def readLoop(self):
try:
in_frame = False
escape = False
command = KISS.CMD_UNKNOWN
data_buffer = ""
command_buffer = ""
last_read_ms = int(time.time()*1000)
while self.serial.is_open:
if self.serial.in_waiting:
byte = 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 = ""
command_buffer = ""
elif (in_frame and len(data_buffer) < RNS.Reticulum.MTU):
if (len(data_buffer) == 0 and command == KISS.CMD_UNKNOWN):
# We only support one HDLC port for now, so
# strip off port nibble
byte = chr(ord(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+byte
elif (command == KISS.CMD_FREQUENCY):
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
command_buffer = command_buffer+byte
if (len(command_buffer) == 4):
self.r_frequency = ord(command_buffer[0]) << 24 | ord(command_buffer[1]) << 16 | ord(command_buffer[2]) << 8 | ord(command_buffer[3])
RNS.log(str(self)+" Radio reporting frequency is "+str(self.r_frequency/1000000.0)+" MHz", RNS.LOG_DEBUG)
self.updateBitrate()
elif (command == KISS.CMD_BANDWIDTH):
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
command_buffer = command_buffer+byte
if (len(command_buffer) == 4):
self.r_bandwidth = ord(command_buffer[0]) << 24 | ord(command_buffer[1]) << 16 | ord(command_buffer[2]) << 8 | ord(command_buffer[3])
RNS.log(str(self)+" Radio reporting bandwidth is "+str(self.r_bandwidth/1000.0)+" KHz", RNS.LOG_DEBUG)
self.updateBitrate()
elif (command == KISS.CMD_TXPOWER):
self.r_txpower = ord(byte)
RNS.log(str(self)+" Radio reporting TX power is "+str(self.r_txpower)+" dBm", RNS.LOG_DEBUG)
elif (command == KISS.CMD_SF):
self.r_sf = ord(byte)
RNS.log(str(self)+" Radio reporting spreading factor is "+str(self.r_sf), RNS.LOG_DEBUG)
self.updateBitrate()
elif (command == KISS.CMD_RADIO_STATE):
self.r_state = ord(byte)
elif (command == KISS.CMD_RADIO_LOCK):
self.r_lock = ord(byte)
elif (command == KISS.CMD_STAT_RX):
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
command_buffer = command_buffer+byte
if (len(command_buffer) == 4):
self.r_stat_rx = ord(command_buffer[0]) << 24 | ord(command_buffer[1]) << 16 | ord(command_buffer[2]) << 8 | ord(command_buffer[3])
elif (command == KISS.CMD_STAT_TX):
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
command_buffer = command_buffer+byte
if (len(command_buffer) == 4):
self.r_stat_tx = ord(command_buffer[0]) << 24 | ord(command_buffer[1]) << 16 | ord(command_buffer[2]) << 8 | ord(command_buffer[3])
elif (command == KISS.CMD_STAT_RSSI):
self.r_stat_rssi = ord(byte)
elif (command == KISS.CMD_RANDOM):
self.r_random = ord(byte)
elif (command == KISS.CMD_ERROR):
if (byte == KISS.ERROR_INITRADIO):
RNS.log(str(self)+" hardware initialisation error (code "+RNS.hexrep(byte)+")", RNS.LOG_ERROR)
elif (byte == KISS.ERROR_INITRADIO):
RNS.log(str(self)+" hardware TX error (code "+RNS.hexrep(byte)+")", RNS.LOG_ERROR)
else:
RNS.log(str(self)+" hardware error (code "+RNS.hexrep(byte)+")", RNS.LOG_ERROR)
else:
time_since_last = int(time.time()*1000) - last_read_ms
if len(data_buffer) > 0 and time_since_last > self.timeout:
data_buffer = ""
in_frame = False
command = KISS.CMD_UNKNOWN
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.name)+" is now offline. Restart Reticulum to attempt reconnection.", RNS.LOG_ERROR)
def __str__(self):
return "RNodeInterface["+self.name+"]"
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