mLRS Bridge

This project based on https://github.com/olliw42/mLRS/tree/main/esp enables advanced communication between the mLRS tx and a computer. This communication enables the following functions

Mavlink UDP bridging between tx transmitter and a GCS.
access to the CLI when using a firmware that enables the CLI based on a PIN being driven low.
flashing of the firmware on the mLRS TX

This currently only has been tested on the easysolder board and requires a special firmware that can compiled by downloading this fork of mLRS

Mavlink bridge

Connect to mLRS AP UDP wifi AP. The bridge broadcasts UDP messages from the tx and send the GCS messages back to the tx via UDP.

Access to the CLI

Access to the CLI is provided using a REST API. Messages are sent to the cli using a post request to the ESP URL.

API URL http://[ESP_IP]/api/v1/cli
Verbs: write, read

Example

Request version

curl --header "Content-Type: application/json" \
  --request POST \
  --data '{"write":"v;"}' \
  http://192.168.4.55:80/api/v1/cli

Read response

curl --header "Content-Type: application/json" \
  --request POST \
  --data '{"read":""}' \
  http://192.168.4.55:80/api/v1/cli

Firmware flashing

Firmware flashing is done using a simple webserver located on the ESP32. The server can be accessed from the following URL http://[ESP_IP]

The firmware is first uploaded to the ESP32 and then flashed to the tx module.

In order for the flashing to work a firmware that inverts the standard TX/RX and the JR pins first needs to be flashed. This is because the serial boot pins of the STM32 are located on PB6/PB7.

Wiring

ESP32 PIN	tx mLRS pin
5	E1
16	S
17	E0
GND	G