I've been able to use pymavlink.mavutil to read telemetry from a .tlog created by pixhawk flight controller in raspberrpi.
data = mavutil.mavlink_connection('mav.tlog')
Now I want to read specific flight parameters from the .tlog . but from
param = data.recv_match(type='PARAM_VALUE')
I get all the parameters. I want to get only parameters like GPS airspeed. and i want to know is this .tlog file give real-time data?? I want to extract real time GPS location. I have connected pixhawk to raspberry pi by connecting telemetry 2 port of the pixhawk to UART tx,rx,gnd of raspberry pi. connection is done through mavproxy.