Wifi mqtt and config

1 files changed, 27 insertions, 3 deletions

diff --git a/README.md b/README.md
index 5abe2c1..01d2c85 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # hello-t-energy-s3
 
-Minimal test sketch for LilyGo T-Energy-S3 board.
+T-Energy-S3 MQTT battery monitor. Connects to WiFi and publishes battery voltage over MQTT/TLS.
 
 ## Setup (one-time)
 
@@ -12,8 +12,21 @@ arduino-cli config add board_manager.additional_urls https://espressif.github.io
 # 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
@@ -33,8 +46,19 @@ arduino-cli monitor --port /dev/ttyACM0 --config baudrate=115200
 ## Expected Output
 
 ```
-Hello T-Energy-S3!
-Battery: 4200 mV
+=== 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
 ...
 ```