def RTCM_converter_thread(server, port, username, password, mountpoint, rtcm_callback=None):
import subprocess
nt = subprocess.Popen(["./ntripclient",
"--server", server,
"--password", password,
"--user", username,
"--mountpoint", mountpoint],
stdout=subprocess.PIPE)
"""nt = subprocess.Popen(["./ntrip.py", server, str(port), username, password, mountpoint],
stdout=subprocess.PIPE)"""
if nt is None or nt.stdout is None:
indev = sys.stdin
else:
indev = nt.stdout
print("RTCM using input {}".format(indev))
while True:
sio = indev
d = ord(sio.read(1))
if d != RTCMv3_PREAMBLE:
continue
pack_stream = BitStream()
l1 = ord(sio.read(1))
l2 = ord(sio.read(1))
pack_stream.append(bs.pack('2*uint:8', l1, l2))
pack_stream.read(6)
pkt_len = pack_stream.read(10).uint
pkt = sio.read(pkt_len)
parity = sio.read(3)
if len(pkt) != pkt_len:
print "Length error {} {}".format(len(pkt), pkt_len)
continue
if True: # TODO check parity
for d in pkt:
pack_stream.append(bs.pack('uint:8', ord(d)))
msg = parse_rtcmv3(pack_stream)
if msg is not None and rtcm_callback is not None:
rtcm_callback(msg)
def decode_rtcm3_pack(buff):
d = ord(buff[0])
if d != RTCMv3_PREAMBLE:
print "RTCM3 preamble error!", d
return
pack_stream = BitStream()
l1 = ord(buff[1])
l2 = ord(buff[2])
pack_stream.append(bs.pack('2*uint:8', l1, l2))
pack_stream.read(6)
pkt_len = pack_stream.read(10).uint
pkt = buff[3:3 + pkt_len]
parity = buff[3 + pkt_len:-1]
if True: # TODO check parity
for d in pkt:
pack_stream.append(bs.pack('uint:8', ord(d)))
msg = parse_rtcmv3(pack_stream)