Reg: Procedure for sending commands to gpsd over control socket.

[RAJESH DASARI]

Hi ,

We are using Trimble Acutime 360 TSIP GPS device in our linux  machine
and it is connected to /dev/ttyS5 .

I am starting the gpsd with the below command.
/usr/sbin/gpsd -F /var/run/gpsd/gpsd.sock -n -N -D 15 /dev/ttyS5

I am trying to reset the GPS device with the control socket, for that
i have below script.

import binascii
import socket
import sys
import time
import os

print("Connecting...")
#GPS_time_req = b'&/dev/ttyS5=\x25'
GPS_time_req = b'!/dev/ttyS5=\x10\x25\x10\x03\n'
#GPS_time_req = b'!/dev/ttyS5=\x10\x21\x10\x03\n'
#GPS_time_req = b'\x10\x21\x10\x03\n'
if os.path.exists("/var/run/gpsd/gpsd.sock"):
    client = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
    client.connect("/var/run/gpsd/gpsd.sock")
    print("Ready.")
    try:
       print ( 'sending "%s"' % GPS_time_req.hex() )
       hexBytes = GPS_time_req.hex()
       print ("encoded bytes ", hexBytes.encode('iso-8859-1') )
       client.send( hexBytes.encode('iso-8859-1'))
       time.sleep(15)
       response = client.recv(4096)
       num_bytes = len(response)
       print ( 'number of bytes ',  num_bytes)
       print ( 'data bytes ', response )
    except KeyboardInterrupt as k:
       print("Shutting down.")
       client.close()
else:
    print("Couldn't Connect!")
    print("Done")

but when i execute the above command , i am getting the below output .
python gps.test.py
Connecting...
Ready.
sending "212f6465762f74747953353d102510030a"
encoded bytes  b'212f6465762f74747953353d102510030a'
number of bytes  6
data bytes  b'ERROR\n'

Please find the attached file for the output from the gpsd when the
above script is executed.  I tried sending different control packets
to GPS device over the control socket but i am getting ERROR response
always.

Could you guys please let me know , is sending the commands to the gps
device over control socket is supported ? if it not supported could
you suggest any other way.  If it is supported could you please let me
know the exact procedure.

I also tried sending the command the command directly to the device
like echo -ne '\x10\x25\x10\x03' > /dev/ttyS5 but i didn't notice any
reset logs on gpsd side to notify that gpsd is actually rebooting.



Thanks,
Rajesh Dasari.

output
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