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The app RAM ORIGIN in both nrf52840 linker scripts has been a hard-coded
0x20006000 (24 KB reserved for S140) since they were introduced, but
sd_ble_enable() with our fixed Bluefruit configuration (one peripheral
link, BANDWIDTH_MAX / ATT MTU 247, 0x1000 attribute table) requires
substantially less. The SoftDevice cannot use the gap and the app image
is linked above it, so every byte between the true requirement and the
ORIGIN is simply unusable RAM - on a part where 2.8.0 field reports
showed the heap arena at 99% use.
Lower the ORIGIN to 0x20004000 in both s140 v6 and v7 scripts. The heap
arena is the linker gap on this platform, so the change is worth exactly
+8,192 B of free heap on every nRF52840 board (verified: rak4631 .heap
section 124,572 -> 132,764 B; both v6- and v7-script boards link with
.data at 0x20004000).
Safety net: Bluefruit.begin()'s return value - previously discarded -
is now checked. If a future SoftDevice or Bluefruit config change raises
the requirement past the reservation, the node logs a critical error
instead of silently running without BLE, with instructions to re-measure
via CFG_DEBUG=1 ("SoftDevice's RAM requires: 0x...").
Meshtastic Firmware
Overview
This repository contains the official device firmware for Meshtastic, an open-source LoRa mesh networking project designed for long-range, low-power communication without relying on internet or cellular infrastructure. The firmware supports various hardware platforms, including ESP32, nRF52, RP2040/RP2350, and Linux-based devices.
Meshtastic enables text messaging, location sharing, and telemetry over a decentralized mesh network, making it ideal for outdoor adventures, emergency preparedness, and remote operations.
Get Started
- 🔧 Building Instructions - Learn how to compile the firmware from source.
- ⚡ Flashing Instructions - Install or update the firmware on your device.
Join our community and help improve Meshtastic! 🚀
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