def _test_transport(host, port, device):
"""Construct a rfx object based on config."""
if port is not None:
try:
conn = rfxtrxmod.PyNetworkTransport((host, port))
except OSError:
return False
conn.close()
else:
try:
conn = rfxtrxmod.PySerialTransport(device)
except serial.serialutil.SerialException:
return False
if conn.serial is None:
return False
conn.close()
return True
