Files
pyModeS/pyModeS/extra/tcpclient.py
2018-06-23 15:19:29 +02:00

199 lines
6.0 KiB
Python

'''
Stream beast raw data from a TCP server, convert to mode-s messages
'''
from __future__ import print_function, division
import os
import sys
import socket
import time
from threading import Thread
if (sys.version_info > (3, 0)):
PY_VERSION = 3
else:
PY_VERSION = 2
class BaseClient(Thread):
def __init__(self, host, port, rawtype):
Thread.__init__(self)
self.host = host
self.port = port
self.buffer = []
self.rawtype = rawtype
if self.rawtype not in ['avr', 'beast']:
print("rawtype must be either avr or beast")
os._exit(1)
def connect(self):
while True:
try:
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.settimeout(10) # 10 second timeout
s.connect((self.host, self.port))
print("Server connected - %s:%s" % (self.host, self.port))
print("collecting ADS-B messages...")
return s
except socket.error as err:
print("Socket connection error: %s. reconnecting..." % err)
time.sleep(3)
def read_avr_buffer(self):
# -- testing --
# for b in self.buffer:
# print(chr(b), b)
# Append message with 0-9,A-F,a-f, until stop sign
messages = []
msg_stop = False
for b in self.buffer:
if b == 59:
msg_stop = True
ts = time.time()
messages.append([self.current_msg, ts])
if b == 42:
msg_stop = False
self.current_msg = ''
if (not msg_stop) and (48<=b<=57 or 65<=b<=70 or 97<=b<=102):
self.current_msg = self.current_msg + chr(b)
self.buffer = []
return messages
def read_beast_buffer(self):
'''
<esc> "1" : 6 byte MLAT timestamp, 1 byte signal level,
2 byte Mode-AC
<esc> "2" : 6 byte MLAT timestamp, 1 byte signal level,
7 byte Mode-S short frame
<esc> "3" : 6 byte MLAT timestamp, 1 byte signal level,
14 byte Mode-S long frame
<esc> "4" : 6 byte MLAT timestamp, status data, DIP switch
configuration settings (not on Mode-S Beast classic)
<esc><esc>: true 0x1a
<esc> is 0x1a, and "1", "2" and "3" are 0x31, 0x32 and 0x33
timestamp:
wiki.modesbeast.com/Radarcape:Firmware_Versions#The_GPS_timestamp
'''
messages_mlat = []
msg = []
i = 0
# process the buffer until the last divider <esc> 0x1a
# then, reset the self.buffer with the remainder
while i < len(self.buffer):
if (self.buffer[i:i+2] == [0x1a, 0x1a]):
msg.append(0x1a)
i += 1
elif (i == len(self.buffer) - 1) and (self.buffer[i] == 0x1a):
# special case where the last bit is 0x1a
msg.append(0x1a)
elif self.buffer[i] == 0x1a:
if i == len(self.buffer) - 1:
# special case where the last bit is 0x1a
msg.append(0x1a)
elif len(msg) > 0:
messages_mlat.append(msg)
msg = []
else:
msg.append(self.buffer[i])
i += 1
# save the reminder for next reading cycle, if not empty
if len(msg) > 0:
reminder = []
for i, m in enumerate(msg):
if (m == 0x1a) and (i < len(msg)-1):
# rewind 0x1a, except when it is at the last bit
reminder.extend([m, m])
else:
reminder.append(m)
self.buffer = [0x1a] + msg
else:
self.buffer = []
# extract messages
messages = []
for mm in messages_mlat:
ts = time.time()
msgtype = mm[0]
# print(''.join('%02X' % i for i in mm))
if msgtype == 0x32:
# Mode-S Short Message, 7 byte, 14-len hexstr
msg = ''.join('%02X' % i for i in mm[8:15])
elif msgtype == 0x33:
# Mode-S Long Message, 14 byte, 28-len hexstr
msg = ''.join('%02X' % i for i in mm[8:22])
else:
# Other message tupe
continue
if len(msg) not in [14, 28]:
# incomplete message
continue
messages.append([msg, ts])
return messages
def handle_messages(self, messages):
"""re-implement this method to handle the messages"""
for msg, t in messages:
print("%f %s" % (t, msg))
def run(self):
sock = self.connect()
while True:
try:
received = sock.recv(1024)
if PY_VERSION == 2:
received = [ord(i) for i in received]
self.buffer.extend(received)
# print(''.join(x.encode('hex') for x in self.buffer))
# process self.buffer when it is longer enough
# if len(self.buffer) < 2048:
# continue
# -- Removed!! Cause delay in low data rate scenario --
if self.rawtype == 'beast':
messages = self.read_beast_buffer()
elif self.rawtype == 'avr':
messages = self.read_avr_buffer()
if not messages:
continue
else:
self.handle_messages(messages)
time.sleep(0.001)
except Exception as e:
print("Unexpected Error:", e)
try:
sock = self.connect()
except Exception as e:
print("Unexpected Error:", e)
if __name__ == '__main__':
# for testing purpose only
host = sys.argv[1]
port = int(sys.argv[2])
client = BaseClient(host=host, port=port)
client.daemon = True
client.run()