ex_telem.py

"""
Example using TREK API using Python.
"""
import time
 
import trek
 
PACKET_DEFINITION = "PdssPayload.RT.PL.24"
 
telem_api = trek.TelemetryApi()
packet = trek.Packet()
packet_buffer = bytearray(4096)
 
 
def main() -> None:
    """
    Main Routine
    """
 
    try:
        telem_api.connect()
        telem_api.cleanse()
 
        # Explains layout of packet
        telem_api.get_packet_definition(PACKET_DEFINITION, packet)
 
        # Gets pointer to specific parameter (can be reused, don't re-assign)
        tank1_fluid = packet.find_parameter("24_TANK1_FLUID_LEVEL")
        tank2_fluid = packet.find_parameter("24_TANK2_FLUID_LEVEL")
        time_param = packet.find_parameter("EHSP=GRT")
 
        # Take 50 data points, 1 per second.
        for _i in range(50):
 
            # Get the newest
            telem_api.get_newest_packet(PACKET_DEFINITION, packet_buffer)
 
            packet.extract(packet_buffer, len(packet_buffer))
 
            # Get values
            time_value = time_param.get_value_as_string()
            tank1_fluid_value = tank1_fluid.get_value()
            tank2_fluid_value = tank2_fluid.get_value()
 
            print(f"{time_value}{tank1_fluid_value=}, {tank2_fluid_value=}")
 
            time.sleep(1)
 
        telem_api.disconnect()
 
    except trek.TrekError as err:
        # Locate friendly message why it failed.
        print(err.find_error_code())
        print(err)
 
 
if __name__ == "__main__":
    main()