2022-06-20 01:27:37 +08:00
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# A UART to network bridge for ESP32
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This example is a demonstration of how Mongoose Library could be integrated
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into an embedded device and provide a UART-to-Network bridge capability:
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- A device opens listening TCP port and Websocket port and waits for connections
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- When a client connects, data is exchanged with the device's UART
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- Everything that client send, is sent to the UART
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- Everything that is read from the UART, gets sent to the client
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- Multiple clients are allowed
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- Live UART console allows to talk to the UART from the web page
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- Web UI is hardcoded into the binary and does not need a filesystem
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# Screenshots
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# Build and flash
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Build requires Docker installed, and uses Espressif's ESP-IDF docker image:
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```sh
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make build
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make flash PORT=/dev/YOURSERIAL
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```
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# Flash pre-built firmware
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You can flash a pre-built firmware to the ESP32 device using the following
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instructions:
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1. Connect your ESP32 device to the workstation. It should be accessible
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via a serial port
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2. Download and unzip ESP32 flashing tool from https://mongoose.ws/downloads/esputil.zip
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3. Download a prebuilt firmware https://mongoose.ws/downloads/uart-bridge.hex into the unzipped directory
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4. Start command prompt (or terminal on Mac/Linux). Run `cd
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PATH/TO/esputil` to go into the unzipped `esputil/` directory. After that, run
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the following command (change `COMPORT` to the board's serial port):
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| OS | Command |
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| ------- | ------- |
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| Windows | <pre><code class="language-bash">.\windows\esputil -p COMPORT flash uart-bridge.hex</code></pre>|
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| Linux | <pre><code class="language-bash">./linux/esputil -p COMPORT flash uart-bridge.hex</pre> |
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| MacOS | <pre><code class="language-bash">./macos/esputil -p COMPORT flash uart-bridge.hex</code></pre> |
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Next step is to monitor and follow the instructions.
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```sh
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esputil -p COMPORT monitor
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```
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Note: if monitor command shows constant restarts, the flash parameters
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settings can be wrong. Reflash your device with `-fp ...` flash parameters
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settings. For example, WROOM-32 based boards use `-fp 0x220`:
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```sh
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esputil -p COMPORT -fp 0x220 flash uart-bridge.hex
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```
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For more on possible options for flash parameters, see
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2022-08-04 01:38:12 +08:00
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https://github.com/cpq/esputil#flash-parameters
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