from __future__ import print_function from time import sleep import sys import serial import threading import time import argparse import struct class RNS(): @staticmethod def log(msg): logtimefmt = "%Y-%m-%d %H:%M:%S" timestamp = time.time() logstring = "["+time.strftime(logtimefmt)+"] "+msg print(logstring) @staticmethod def hexrep(data, delimit=True): delimiter = ":" if not delimit: delimiter = "" hexrep = delimiter.join("{:02x}".format(ord(c)) for c in data) return hexrep @staticmethod def prettyhexrep(data): delimiter = "" hexrep = "<"+delimiter.join("{:02x}".format(ord(c)) for c in data)+">" return hexrep class Interface: IN = False OUT = False FWD = False RPT = False name = None def __init__(self): pass class KISS(): FEND = chr(0xC0) FESC = chr(0xDB) TFEND = chr(0xDC) TFESC = chr(0xDD) CMD_UNKNOWN = chr(0xFE) CMD_DATA = chr(0x00) CMD_TXDELAY = chr(0x01) CMD_P = chr(0x02) CMD_SLOTTIME = chr(0x03) CMD_TXTAIL = chr(0x04) CMD_FULLDUPLEX = chr(0x05) CMD_SETHARDWARE = chr(0x06) CMD_READY = chr(0x0F) CMD_AUDIO_PEAK = chr(0x12) CMD_EN_DIAGS = chr(0x13) CMD_RETURN = chr(0xFF) @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 KISSInterface(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, preamble, txtail, persistence, slottime, flow_control): 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.packet_queue = [] self.flow_control = flow_control self.interface_ready = False 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: 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 "+self.port) raise e if self.serial.is_open: # Allow time for interface to initialise before config 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 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") else: raise IOError("Could not open serial port") def askForPeak(self): kiss_command = KISS.FEND+KISS.CMD_AUDIO_PEAK+chr(0x01)+KISS.FEND written = self.serial.write(kiss_command) if written != len(kiss_command): raise IOError("Could not ask for peak data") def displayPeak(self, peak): peak_value = struct.unpack("b", peak) #RNS.log("Peak is: "+RNS.hexrep(peak)) RNS.log("Peak is: "+str(peak_value[0])) def setPreamble(self, preamble): preamble_ms = preamble preamble = int(preamble_ms / 10) if preamble < 0: preamble = 0 if preamble > 255: preamble = 255 RNS.log("Setting preamble to "+str(preamble)+" "+chr(preamble)) kiss_command = KISS.FEND+KISS.CMD_TXDELAY+chr(preamble)+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 = KISS.FEND+KISS.CMD_TXTAIL+chr(txtail)+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 = KISS.FEND+KISS.CMD_P+chr(persistence)+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 = KISS.FEND+KISS.CMD_SLOTTIME+chr(slottime)+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 = KISS.FEND+KISS.CMD_READY+chr(0x01)+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 enableDiagnostics(self): kiss_command = KISS.FEND+KISS.CMD_EN_DIAGS+chr(0x01)+KISS.FEND written = self.serial.write(kiss_command) if written != len(kiss_command): raise IOError("Could not enable KISS interface diagnostics") def disableDiagnostics(self): kiss_command = KISS.FEND+KISS.CMD_EN_DIAGS+chr(0x00)+KISS.FEND written = self.serial.write(kiss_command) if written != len(kiss_command): raise IOError("Could not disable KISS interface diagnostics") def processIncoming(self, data): RNS.log("Decoded packet"); def processOutgoing(self,data): pass def queue(self, data): pass def process_queue(self): pass def readLoop(self): try: in_frame = False escape = False command = KISS.CMD_UNKNOWN data_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 = "" elif (in_frame and len(data_buffer) < 611): if (len(data_buffer) == 0 and command == KISS.CMD_UNKNOWN): 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_AUDIO_PEAK): self.displayPeak(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 = "" in_frame = False command = KISS.CMD_UNKNOWN escape = False sleep(0.08) self.askForPeak() except Exception as e: self.online = False RNS.log("A serial port error occurred, the contained exception was: "+str(e)) RNS.log("The interface "+str(self.name)+" is now offline. Restart Reticulum to attempt reconnection.") def __str__(self): return "KISSInterface["+self.name+"]" if __name__ == "__main__": parser = argparse.ArgumentParser(description="OpenModem Audio Level Monitor") parser.add_argument("port", nargs="?", default=None, help="serial port where RNode is attached", type=str) args = parser.parse_args() if args.port: kiss_interface = KISSInterface(None, "OpenModem Interface", args.port, 115200, 8, "N", 1, 150, 10, 255, 20, False) kiss_interface.enableDiagnostics() raw_input(); else: print("") parser.print_help() print("") exit()