I took the time to update and improve the tracker firmware, including removing secret references. It is now running quite stably on an Arduino UNO and SIM808 EVB-V3.2.4.

However, some issues arose when adding a monitor: memory usage needs to be optimized, and the SIM808 EVB-V3.2.4 requires a manual startup each time, which isn’t practical for real-world use.

Next, I’ll optimize the memory usage and then switch to a more compact board, such as the Arduino Pro Micro, which has slightly more SRAM.

The repository is now available here: GPS-Tracker Firmware