GSoC report - Moxxy MUC implementation

Posted by Ikjot Singh Dhody on 20.08.2023

GSoC Final Report: XMPP Standards Foundation - Moxxy: Implement Group Chats

Project: Moxxy - Implement Group Chats
Organization: XMPP Standards Foundation
Duration: March 2023 - August 2023
Student: Ikjot Singh Dhody
Mentor: Alexander


This report presents the culmination of my work on the GSoC project “Moxxy: Implement Group Chats” under the mentorship of Alexander at the XMPP Standards Foundation. Over the course of this project, I have been engaged in implementing a group chat feature for the Moxxy application, aiming to enhance its functionality and user experience.

About Me

Personal and Social/Contact Details

  • Name: Ikjot Singh Dhody
  • Jabber ID: ikjot-2605[at]
  • Email: ikjotsd[at]
  • GitHub: ikjot-2605
  • LinkedIn: LinkedIn Profile

Educational Background

  • University: National Institute of Technology Karnataka, Surathkal
  • Major: Computer Science and Engineering
  • Year: Senior Year
  • Degree: Bachelor of Technology (B. Tech)

The Project

Before getting into the details of the actual project - here is a demo screencast for the implementation:

I have outlined the features I implemented through the GSoC period below.

PRs merged

The group chat feature required changes to the Moxxy codebase, as well as the moxxmpp codebase. Moxxmpp is the data worker that sends and maintains all the request requirements of the Moxxy frontend. These are the list of contributions across both projects:

  • Joining rooms and getting disco info for the room.
  • Sending messages to a group chat and receiving messages from the group chat.
  • Leaving the group chat.
  • Displaying a UI for joining a group chat and providing a nickname.
  • Handling group chat details and database support.
  • Handling group chat errors and basic error handling.
  • Adding a GroupchatDetails model.
  • Adding UI elements for group chat, such as title and nickname fields.
  • Adding documentation to group chat service methods.
  • Minor code refactoring and naming enhancements.
  • Enhancing enums for conversation types.
  • Removing unnecessary translation strings.
  • Improving UI and formatting.

Outlined below are commits made across both codebases throughout the GSoC period.


There were 2 PRs merged for this codebase.

  • XEP-0421 support for occupant ID support.
Serial Number Commit Hash Description
1 255d0f88e0 feat(xep): Use cascading operation to return state
2 fa11a3a384 feat(xep): Checked for the occupant-id directly.
3 ac5bb9e461 feat(xep): Implement XEP 0421 in Moxxmpp.
  • XEP-0045 support for MUC support.
Serial Number Commit Hash Description
1 b2724aba0c Merge branch ‘master’ into xep_0045
2 d3742ea156 feat(xep): Small fixes - MUC Example.
3 8b00e85167 feat(xep): Add example for XEP 0045 Moxxmpp.
4 04dfc6d2ac feat(xep): Replace DiscoError with StanzaError.
5 9e70e802ef Merge branch ‘master’ into xep_0045
6 3ebd9b86ec feat(xep): Fix lint issues and use moxlib for result.
7 a873edb9ec feat(xep): Check for null nick before leaveRoom.
8 e6bd6d05cd feat(xep): Remove NOOP cache access.
9 b7d53b8f47 feat(xep): Add docstings for the XEP-0045 routines
10 217c3ac236 feat(xep): Fix cache issue with join/leaveRoom.
11 51bca6c25d feat(xep): XEP-0045 cache fixes.
12 8728166a4d feat(xep): Add cache and roomstate to MUC implementation.
13 1f1321b269 feat(xep): Small fixes - review cycle 1.
14 66195f66fa Merge branch ‘master’ into xep_0045
15 70fdfaf16d feat(xep): Fix imports for xep_0045 files.
16 cd73f89e63 feat(xep): Remove duplicate manager string
17 05c41d3185 feat(xep): Refactor sendMessage to allow groupchat
18 64a8de6caa feat(xep): Set base for XEP 0045 implementation
19 68809469f6 feat(xep): Add joinRoom, leaveRoom routines.
20 762cf1c77a feat(xep): Set base for XEP 0045 implementation


  • Implement MUCs in Moxxy
Serial Number Commit Hash Description
1 549e61a168 feat(all): Fix linter issues.
2 26bcaccd81 Merge branch ‘master’ into feat/groupchat
3 df5810a347 feat(all): Formatting change, lock file update
4 ef931c566f feat(all): Send messages/chat state from Moxxy to MUC.
5 a3d4883406 feat(all): Remove unnecessary buttons/options for MUC.
6 532f0b1bb2 feat(all): Formatting fix, and navigation fix.
7 a98fe0d9f3 feat(all): Minor fixes - strings, formatting.
8 a7c3bd507f Merge branch ‘master’ of into feat/groupchat
9 fba2cf86ae feat(all): Minor formatting changes.
10 af481bf465 feat(all): remove unnecessary comparator override.
11 e6ae8182c2 feat(all): Organize import in main.dart.
12 de7b9adfa6 feat(all): Fix user flow for joining MUC.
13 e4f98bb82f feat(all): Add label to nick text field.
14 56d6f97168 feat(all): Minor changes, fixes.
15 b0067f055f feat(all): Move away from exception type design.
16 bd094dfc9a feat(all): Remove unnecessary function.
17 7e9d7d6281 feat(all): Check if Groupchat exists before method.
18 2cf781459d feat(all): Debug mode and translatable string
19 4ff9e3c81e feat(all): Remove title from GroupchatDetails.
20 e337f1c579 feat(all): Minor refactors - naming.
21 7c840334e1 feat(all): Add docs to groupchat service methods.
22 06eab1d6f5 feat(all): Make ConversationType an enhanced enum.
23 008e816d70 feat(all): Rename JoinGroupchatResultEvent.
24 2bbbc164b5 feat(all): Remove incorrect translations.
25 11f4fd9932 feat(all): Add title to GroupchatDetails.
26 a1451c6fbf feat(all): Refactor groupchat to new object in db.
27 993da40297 feat(all): Complete join groupchat flow.
28 09684b1268 feat(all): Fix fromDatabaseJson for MUC details.
29 0abb89cf38 feat(all): Fix database issues with nick.
30 7880f51b76 feat(all): Add db support for GroupchatDetails.
31 f0a79ca0e0 feat(all): Add GroupchatDetails model.
32 06dcd5491b feat(all): Basic groupchat error handling set up.
33 3641be4f56 feat(all): Join room functionality complete.
34 18e28c3bbf feat(all): Groupchat service/bloc updated.
35 62e39bf066 feat(all): Set base for groupchat implementation.


  • Was able to produce a working model of groupchats in Moxxy.

  • Started the design approach from scratch and pretty much stuck to it till the end gave me confidence in my design capability.

  • Fruitful discussions and review cycles were conducted that allowed for a smooth GSoC experience.

Challenges Faced

  • Needed to understand 2 different codebases, and the architecture of the project. This was a pretty interesting, albeit challenging task that took me a while to master.

  • Managing the busy schedule with GSoC work, family, college among other things was difficult. Also, managing a job in the latter parts was also challenging but a rewarding experience.

  • The complete virtual approach was slightly difficult, and although not practical - it might have been slightly better with inter-GSoC meetings.


  • Implemented group chat (Multi-User Chat or MUC) support in the Moxxy project.
  • Successfully added features for joining a group chat room, sending messages to the room, and receiving messages from the room.
  • Learned to handle various aspects of XMPP communication, including sending and receiving messages, and interacting with group chat services.
  • Gained insights into implementing complex functionality in a Flutter application, involving UI components, service classes, and database interactions.
  • Collaborated with experienced developers through code reviews to improve code quality and ensure adherence to best practices.
  • Acquired knowledge of working with the XMPP protocol, understanding its intricacies and how it relates to group chat interactions.
  • Learned to manage and address feedback from code reviewers, making necessary adjustments to improve code readability and functionality.
  • Discovered the importance of proper error handling in real-time communication scenarios, such as handling different types of group chat errors.
  • Gained experience in integrating new features while maintaining the overall architecture and user experience of the application.
  • Understood the complexities of XMPP server behavior, including handling discussion history and preventing message loops.
  • Explored techniques for optimizing communication performance, such as preventing redundant message processing.
  • Improved skills in project management, including version control practices, managing branches, and resolving merge conflicts.
  • Gained familiarity with the process of creating, testing, and merging pull requests in a collaborative development environment.
  • Developed a better understanding of Flutter’s state management, navigation, and widget composition for creating feature-rich user interfaces.
  • Learned to balance feature development with code quality, addressing both functional and non-functional aspects of the implementation.
  • Explored advanced Flutter topics, such as handling asynchronous operations, managing state, and integrating with external libraries.
  • Gained a deeper understanding of how group chat and real-time communication play a significant role in modern applications.
  • Developed the ability to diagnose and troubleshoot issues related to communication and user interface interactions.
  • Strengthened communication skills by participating in technical discussions and effectively conveying ideas and solutions.

Future Work

The future remaining work has been enlisted in this issue by my mentor here.

This includes a list of improvements, bug fixes and general future requirements that will be needed to make the groupchat experience pleasurable for the users of Moxxy.


Participating in GSoC has been an enriching experience. I’ve learned valuable skills, collaborated with mentors and the open-source community, and contributed to the Moxxy project. I’m grateful to XMPP Standards Foundation for this opportunity and look forward to continuing my journey in the world of open-source software development.


I would like to express my gratitude to my mentor Alexander for their guidance and support throughout this project. His guidance and understanding is what allowed me to pull through and complete the GSoC with a happy mind. I also want to thank the XMPP Standards Foundation community for their encouragement and feedback.