1. Prerequisites
All of this is done with Arduino IDE 2.0.0-rc9.4 or later
Install the latest ESP32 board using the instructions and stable release link at https://docs.espressif.com/projects/arduino-esp32/en/latest/installing.html
Install https://github.com/khoih-prog/WebServer_WT32_ETH01/releases/tag/v1.5.0 or newer
Install https://github.com/plapointe6/EspMQTTClient and its dependency, PubSubClient
Install https://github.com/ayushsharma82/AsyncElegantOTA
Install https://github.com/me-no-dev/ESPAsyncWebServer
Install https://github.com/me-no-dev/AsyncTCP
Finally, the example code and a readme similar to this one is available here:
https://github.com/PockyBum522/WT32_ETH01-OTA-OTEthernet-Example
2. How to connect FTDI and upload
Short GPIO 0 to GND any time you are about to upload.
Set FTDI board to 5v and not 3.3v
| FTDI Pin | WT32-ETH01 Pin |
| RX | TX0 |
| TX | RX0 |
| GND | GND |
| VCC | 5V |
Select ESP32 Dev Module in Arduino IDE
When done programming, unshort GPIO 0 and GND and repower to actually run sketch
3. Getting Ethernet example running
Open File > Examples > WebServer_WT32_ETH01 > HelloServer
Update myIP and myGW (Gateway) at top of code.
Once uploaded, pull the GPIO0 short to GND and reboot the board.
Navigate from a web browser to http://192.168.1.232/ (Or whatever you changed myIP to)
You should see “Hello from HelloServer running on WT32-ETH01” in your browser
4. Getting basic MQTT example working:
Open File > Examples > WebServer_WT32_ETH01 > MQTTClient_Auth
Update myIP, myGW, const char* mqttServer, const char *ID, const char *TOPIC, and const char *subTopic
Also change line 76 to: if (client.connect(“arduino”, “[YOURUSERNAMEHERE]”, “[MQTTPASSWORDGOESHERE]”))
Upload, run. Verify you see MQTT messages on the specified topics
5. Getting OTA over Ethernet working
Open MQTT_And_OTEthernet_Example.ino
Change the network/MQTT settings.
Upload, run. Take note of what IP the board is on, you should be able to see this both in the serial monitor and in the MQTT messages when the board first starts.
You should see some test MQTT messages on *TOPIC
Now, change something in the sketch, such as the vXX number down in data, in loop()
Go to Sketch > Export compiled binary
You should now see a build folder next to the MQTT_And_OTEthernet_Example.ino file
Go into build\esp32.esp32.esp32
The file you will be uploading to do an OTA update is MQTT_And_OTEthernet_Example.ino.bin in that folder
Go to http://192.168.X.X/update (Or whatever your board IP is that you noted earlier.)
Click “Choose file” and browse to the MQTT_And_OTEthernet_Example.ino.bin that you made earlier when you clicked Export compiled binary