Add MQTT support project description for 2026

Added project description for MQTT support in Catrobat.

Author: wslany

pages/development/google-summer-of-code/2026.md

@@ -34,6 +34,29 @@ These ideas are just some topics we came up with, where currently nobody is work
 ## Project Descriptions
 {: .no_toc }
 
+### Multiplayer, IoT, and Home Assistant support via two MQTT bricks
+
+90, 175 or 350 hours
+{: .label .label-blue }
+
+{: .highlight  }
+> **Required Skills**: Kotlin, Android-Development, Agile Development, Test Driven Development, Clean Code<br>
+> **Possible Mentors**: Wolfgang Slany, XXXXX <br>
+> **Expected Outcome**: Two new bricks for sending and receiving MQTT messages<br>
+> **Difficulty level**: Advanced 
+
+Implement MQTT support for the Catrobat language in Catroid (Pocket Code and its flavors) so Catrobat programs can publish/receive network messages for multiplayer games, IoT, and Home Assistant setups. Add two new Catrobat bricks (that need to be activated via the app settings): 
+- Broadcast … via MQTT on channel …
+- When you receive a message via MQTT on channel … store it in …
+
+with broker/TLS/auth/client-id configured globally in app settings, and lazy connect/subscribe to avoid boilerplate. Provide example projects for two multiplayer architectures:
+- one phone acting as a local hub (extending the existing Bluetooth multiplayer variables concept) and
+- a dedicated hub, most likely on the local WLAN (e.g., Mosquitto), coordinating multiple players; plus an Home Assistant-oriented topic convention under catrobat/... enabling wall-tablet dashboards for home automations with Tuya/Smart Life and other supported hardware.
+
+Ensure rock-solid reliability (reconnect/offline handling) and strong automated tests for core logic (especially topic-filter matching and message routing). Interested applicants should contact Wolfgang Slany early (as soon as possible) for additional applicant instructions, test-ticket, and expectations.
+
+<hr>
+
 ### Pocket Paint Flutter
 
 350 Hours