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# hello-t-energy-s3
T-Energy-S3 MQTT battery monitor. Connects to WiFi and publishes battery voltage over MQTT/TLS.
## Setup (one-time)
```bash
# Add ESP32 board manager
arduino-cli config init
arduino-cli config add board_manager.additional_urls https://espressif.github.io/arduino-esp32/package_esp32_index.json
# Install ESP32 core
arduino-cli core update-index
arduino-cli core install esp32:esp32
# Install PubSubClient library
arduino-cli lib install "PubSubClient"
```
## Configuration
Copy `config.example.h` to `config.h` and fill in your values:
```bash
cp config.example.h config.h
```
Then edit `config.h` with your WiFi and MQTT settings.
## Build & Upload
```bash
# Find your port
arduino-cli board list
# Compile
arduino-cli compile --fqbn "esp32:esp32:esp32s3:CDCOnBoot=cdc,FlashSize=16M,PSRAM=opi" .
# Upload (replace /dev/ttyACM0 with your port)
arduino-cli upload --fqbn "esp32:esp32:esp32s3:CDCOnBoot=cdc,FlashSize=16M,PSRAM=opi" --port /dev/ttyACM0 .
# Monitor
arduino-cli monitor --port /dev/ttyACM0 --config baudrate=115200
```
## Expected Output
```
=== T-Energy-S3 MQTT Monitor ===
MAC Address: AA:BB:CC:DD:EE:FF
Scanning WiFi...
Found 5 networks:
1: MyNetwork (-45 dBm)
...
Connecting to MyNetwork...
Connected! IP: 192.168.1.100
Connecting to MQTT mqtt.example.com:8883...
MQTT connected!
Battery: 4200 mV
Published to my/topic: 4200
...
```
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