MMDVM-Based Projects to Merge Into One Open-Source Project

September 29, 2023

From ARDC:

Funded by a grant from Amateur Radio Digital Communications (ARDC), Jonathan Naylor (G4KLX) has been hired as a full-time software developer. Jonathan is a pioneer of digital voice software, developing software for D-STAR, DMR, System Fusion, M17, NXDN, P.25, and POCSAG.

With a full-time software developer dedicated to the MMDVM project, many important tasks can be carried out, such as:

  • Bug mitigation
  • Improving the core code module (MMDVMHost) relating to both the display interfaces and digital modes
  • Adding support for industry standards, such as Message Queuing Telemetry Transport (MQTT), which is analogous to a fast and reliable texting system that allows devices to communicate efficiently
  • Creating a web-based configuration and monitoring solution
  • Creating a portable UI on additional hardware platforms
  • Adding KISS/AX.25 packet support along with higher speed data rates to run on existing MMDVM hardware
  • Porting firmware to next generation microcontrollers

Work has started on the aforementioned software upgrades to MMDVM, and many of the long-term bugs in the software have been fixed. Regarding their progress toward improving MMDVMHost, they have added support for AX.25, and they now provide full support for amateur-driven M17 digital voice protocol.

Work is currently underway to develop 9600, 19200, and 38400 baud packet modes that support narrow bandwidth using a modulation (4FSK) similar to Digital Mobile Radio (DMR). The packet modes include support for IL2P, which is a new link layer protocol with integral forward error correction (FEC).

To learn more about the MMDVM project, visit

Source: ARDC  open_in_new

Submit a Story

Do you have a story to share with the ham radio community? We want to feature your amateur radio related story, event, project, or anything else related to the world of ham radio.

Submit your story