matrixbot: Send a greeting when first connected

src/matrixbot.py

@@ -41,6 +41,7 @@ class MatrixBot:
                     logger.debug(f"left room {room_id} since all other users left")
 
             logger.info("initial sync done, ready for work")
+            await self._send_greeting()
 
     async def _on_invite(self, room, event):
         logger.info(f"invited by {event.sender} to {room.room_id}")
@@ -93,6 +94,20 @@ class MatrixBot:
                 },
             )
 
+    async def _send_greeting(self):
+        """Send a greeting to make sure the bot is working."""
+        assert self.client
+
+        for room_id in self.client.rooms:
+            await self.client.room_send(
+                room_id=room_id,
+                message_type="m.room.message",
+                content={
+                    "msgtype": "m.text",
+                    "body": "Whaaaaaaa, good monning. I'll check slots for you.",
+                },
+            )
+
     async def run(self):
         """Start the bot."""
         logger.info(f"Connecting to {self.homeserver}")