Revise MQTT idea and application process details

Updated the project requirements for Android ideas and added application instructions.

Author: wslany

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

@@ -26,7 +26,7 @@ You may use AI tools as much as you like (brainstorming, code generation, refact
 
 - Usage of Git and GitHub
 - Software testing (e.g., test doubles) and test-driven development
-- Kotlin or Flutter for Android ideas
+- Kotlin, Java, or Flutter for Android ideas (depending on target project)
 - Swift for iOS ideas
 - Also please check that you have the proper hardware for the development (e.g., an Android/iOS smartphone for testing some of the projects, Mac for iOS development etc)
 
@@ -58,7 +58,9 @@ Broker/TLS/auth/client-id are configured globally in app settings, and connect/s
 - one phone acting as a local hub (extending the existing Bluetooth multiplayer variables concept) and
 - a dedicated hub over local Wi-Fi (e.g., Mosquitto) coordinating multiple players. Also provide a Home Assistant-oriented topic convention under catrobat/... enabling wall-tablet dashboards and home automations (Tuya/Smart Life and other Home Assistant-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.
+Ensure reliability (reconnect/offline handling) and strong automated tests for core logic (especially topic-filter matching and message routing). 
+
+To apply for this project idea, please complete <a target="_blank" href="">this entry task</a> and include the links to the requested demo artifact in your application.
 
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