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// T-Energy-S3 MQTT Battery Monitor
// Connects to WiFi, publishes battery voltage over MQTT/TLS
#include <WiFi.h>
#include <WiFiClientSecure.h>
#include <PubSubClient.h>
#include "config.h"
#define BATTERY_PIN 3
WiFiClientSecure secureClient;
PubSubClient mqtt(secureClient);
unsigned long lastPublish = 0;
unsigned long lastWifiCheck = 0;
void printMac()
{
Serial.printf("MAC Address: %s\n", WiFi.macAddress().c_str());
}
void scanWifi()
{
Serial.println("Scanning WiFi...");
int n = WiFi.scanNetworks();
if (n == 0)
{
Serial.println("No networks found");
}
else
{
Serial.printf("Found %d networks:\n", n);
for (int i = 0; i < n; i++)
{
Serial.printf(" %d: %s (%d dBm)%s\n",
i + 1,
WiFi.SSID(i).c_str(),
WiFi.RSSI(i),
WiFi.encryptionType(i) == WIFI_AUTH_OPEN ? "" : " *");
}
}
Serial.println();
}
bool connectWifi()
{
if (WiFi.status() == WL_CONNECTED)
return true;
Serial.printf("Connecting to %s...\n", WIFI_SSID);
WiFi.begin(WIFI_SSID);
int attempts = 0;
while (WiFi.status() != WL_CONNECTED && attempts < 20)
{
delay(500);
Serial.print(".");
attempts++;
}
if (WiFi.status() == WL_CONNECTED)
{
Serial.printf("\nConnected! IP: %s\n", WiFi.localIP().toString().c_str());
return true;
}
else
{
Serial.println("\nWiFi connection failed");
return false;
}
}
bool connectMqtt()
{
if (mqtt.connected())
return true;
Serial.printf("Connecting to MQTT %s:%d...\n", MQTT_HOST, MQTT_PORT);
String clientId = "t-energy-" + WiFi.macAddress();
if (mqtt.connect(clientId.c_str(), MQTT_USER, MQTT_PASS))
{
Serial.println("MQTT connected!");
return true;
}
else
{
Serial.printf("MQTT failed, rc=%d\n", mqtt.state());
return false;
}
}
void setup()
{
Serial.begin(115200);
delay(2000);
Serial.println("\n=== T-Energy-S3 MQTT Monitor ===\n");
pinMode(BATTERY_PIN, INPUT);
analogReadResolution(12);
analogSetPinAttenuation(BATTERY_PIN, ADC_11db);
WiFi.mode(WIFI_STA);
WiFi.disconnect();
delay(100);
printMac();
scanWifi();
// TLS setup - skip cert verification for now
secureClient.setInsecure();
mqtt.setServer(MQTT_HOST, MQTT_PORT);
connectWifi();
if (WiFi.status() == WL_CONNECTED)
{
connectMqtt();
}
}
void loop()
{
unsigned long now = millis();
// Check WiFi every 5 seconds
if (now - lastWifiCheck >= 5000)
{
if (WiFi.status() != WL_CONNECTED)
{
Serial.println("WiFi disconnected, reconnecting...");
connectWifi();
}
lastWifiCheck = now;
}
// Maintain MQTT connection
if (WiFi.status() == WL_CONNECTED)
{
if (!mqtt.connected())
{
connectMqtt();
}
mqtt.loop();
}
// Publish voltage every 5 seconds
if (now - lastPublish >= 5000)
{
int mv = analogReadMilliVolts(BATTERY_PIN) * 2;
Serial.printf("Battery: %d mV\n", mv);
if (mqtt.connected())
{
char payload[16];
snprintf(payload, sizeof(payload), "%d", mv);
if (mqtt.publish(MQTT_TOPIC, payload))
{
Serial.printf("Published to %s: %s\n", MQTT_TOPIC, payload);
}
else
{
Serial.println("Publish failed");
}
}
lastPublish = now;
}
}
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