When someone pushes the ring button and there is no remote target connected to sip proxy nothing happens on the portero side. The guest don't know if it works or not.
A sound should be played every time the ring button is pushed.

A a config.rc.sample with the parameters needed by portero.
This file cam be modified and added to the end of the config.rc generated by linphone

Error when sending message from client to portero

Traceback (most recent call last):
File "portero.py", line 121, in message_received
msg = room.create_message("received " +message)
TypeError: cannot concatenate 'str' and 'linphone.ChatMessage' objects

Traceback (most recent call last):
File "portero.py", line 142, in message_received
room.send_chat_message(msg=responseMsg)
AttributeError: 'linphone.ChatRoom' object has no attribute 'send_chat_message'

Open the door when a message is received.

The configuration of the door lock should be included in the config.rc file with the following parameters:

#if the door lock has memory:
# True: door lock remains open until the door is opened and closed.
# False: door lock is open only while powered. 
door_lock_memory=true/false

# time (in seconds) the lock door must be powered to open
# if door_lock_memory=true just a second should be enough.
# if door_lock_memory=false more time must be given to the visitor to open the door 
door_lock_time= 1

Add MQTT support to turn On/Off light based on external day/night sensor.