Updated DBus service (markdown)

DBus-service.md

@@ -37,3 +37,25 @@ To avoid the startup time of the JVM for the dbus client, you can use any dbus c
 Example with `dbus-send`:
 
     dbus-send --session --type=method_call --print-reply --dest="org.asamk.Signal" /org/asamk/Signal org.asamk.Signal.sendMessage string:MessageText array:string: string:RECIPIENT
+
+
+### Receive messages from signal-cli daemon
+The signal-cli daemon publishes new messages to dbus.
+Here's an example using python:
+
+```python3
+def msgRcv (timestamp, source, groupID, message, attachments):
+   print ("Message", message, "received in group", signal.getGroupName (groupID))
+   return
+
+from pydbus import SystemBus
+from gi.repository import GLib
+
+bus = SystemBus()
+loop = GLib.MainLoop()
+
+signal = bus.get('org.asamk.Signal')
+
+signal.onMessageReceived = msgRcv
+loop.run()
+```