text: #!/usr/bin/env python3
  import os
  import sys
  import time
  import _thread
  
  sys.path.append(os.path.join(os.path.dirname(os.path.realpath(__file__)), ".."))
  from panda import Panda  # noqa: E402
  
  # This script is intended to be used in conjunction with the echo_loopback_test.py test script from panda jungle.
  # It sends a reversed response back for every message received containing b"test".
  
  def heartbeat_thread(p):
    while True:
      try:
        p.send_heartbeat()
        time.sleep(0.5)
      except Exception:
        continue
  
  # Resend every CAN message that has been received on the same bus, but with the data reversed
  if __name__ == "__main__":
    p = Panda()
    _thread.start_new_thread(heartbeat_thread, (p,))
    p.set_safety_mode(Panda.SAFETY_ALLOUTPUT)
    p.set_power_save(False)
  
    while True:
      incoming = p.can_recv()
      for message in incoming:
        address, notused, data, bus = message
        if b'test' in data:
          p.can_send(address, data[::-1], bus)
  