Hello,
Thanks a lot for your kind support 
, I have edited the “local_config.json” and added the following two lines.
“gps”: true,
“gps_tty_path”:“/dev/ttyXRUSB2”,
On the TTN application payload, now the GPS coordinates are parsed along with time field in nanoseconds.
I then installed the same packet forwarder on another aep multitech conduit , however, here the time field is always in microseconds (rarely it shows nano seconds). Do you know how to dig in to this matter?