Add getter for relay state

Signed-off-by: Thomas Klaehn <tkl@blackfinn.de>

relay_rpc/main.py

@@ -25,6 +25,12 @@ def switch_relay(relay: int, state: bool):
     log.info("switching relay %s (pin %s) %s", relay, pin, state)
     GPIO.output(pin, not state)
 
+def get_relay_state(relay: int) -> bool:
+    pin = int(GPIOS[relay - 1])
+    state = GPIO.input(pin)
+    log = logging.getLogger()
+    log.info("Relay state of relay %s (pin %s) %s", relay, pin, state)
+    return state
 
 def init_relays():
     """Init relays"""
@@ -47,6 +53,7 @@ def main():
     server = SimpleXMLRPCServer((HOST, PORT), allow_none=True)
 
     server.register_function(switch_relay, 'switch_relay')
+    server.register_function(get_relay_state, 'get_relay_state')
 
     log.info('Control-c to quit')
     server.serve_forever()