A UART to network bridge for ESP32

See detailed tutorial at https://mongoose.ws/tutorials/esp32/uart-bridge/

Flash pre-built firmware

You can flash a pre-built firmware to the ESP32 device using the following instructions:

Connect your ESP32 device to the workstation. It should be accessible via a serial port
Download and unzip ESP32 flashing tool from https://mongoose.ws/downloads/esputil.zip
Download a prebuilt firmware https://mongoose.ws/downloads/uart-bridge.hex into the unzipped directory
Start command prompt (or terminal on Mac/Linux). Run cd PATH/TO/esputil to go into the unzipped esputil/ directory. After that, run the following command (change COMPORT to the board's serial port):

OS	Command
Windows	<pre><code class="language-bash">.\windows\esputil -p COMPORT flash uart-bridge.hex</code></pre>
Linux	<pre><code class="language-bash">./linux/esputil -p COMPORT flash uart-bridge.hex</pre>
MacOS	<pre><code class="language-bash">./macos/esputil -p COMPORT flash uart-bridge.hex</code></pre>

Next step is to monitor and follow the instructions.

esputil -p COMPORT monitor

Note: if monitor command shows constant restarts, the flash parameters settings can be wrong. Reflash your device with -fp ... flash parameters settings. For example, WROOM-32 based boards use -fp 0x220:

esputil -p COMPORT -fp 0x220 flash uart-bridge.hex

For more on possible options for flash parameters, see https://github.com/cpq/esputil#flash-parameters