Add dual temperature threshold control with MLX sensor fallback

- Add separate thresholds for room temp (21°C) and floor temp (22°C)
- Use t1/t2 downlink commands for setting thresholds
- Automatically disable floor temp monitoring if MLX sensor fails
- Relay turns off if either temperature threshold is exceeded
- Robust operation with or without floor temperature sensor

src/lora/lorawan.c

@@ -14,6 +14,7 @@ LOG_MODULE_REGISTER(lorawan_class_a);
 extern bool relais_state;
 extern bool relais_manual_override;
 extern uint8_t temperature_threshold;
+extern uint8_t floor_temp_threshold;
 const static struct device *lora_dev;
 static struct lorawan_join_config join_cfg;
 static uint8_t dev_eui[8];
@@ -62,19 +63,34 @@ static void dl_callback(uint8_t port, uint8_t flags, int16_t rssi, int8_t snr, u
 			LOG_WRN("Invalid relais command value: %d (valid: 0=OFF, 1=AUTO)", relais_value);
 		}
 	}
-	/* Temperature threshold command: t[temp] (e.g., "t18" for 18°C) */
-	else if (len > 2 && hex_data[0] == 't')
+	/* Room temperature threshold command: t1[temp] (e.g., "t1" + 18 for 18°C) */
+	else if (len > 3 && hex_data[0] == 't' && hex_data[1] == '1')
 	{
-		uint8_t new_threshold = hex_data[1];
+		uint8_t new_threshold = hex_data[2];
 		if (new_threshold >= 10 && new_threshold <= 35) // Valid range 10-35°C
 		{
 			temperature_threshold = new_threshold;
 			relais_manual_override = false; // Re-enable automatic control
-			LOG_INF("Temperature threshold updated to %d°C, automatic control enabled", temperature_threshold);
+			LOG_INF("Room temperature threshold updated to %d°C, automatic control enabled", temperature_threshold);
 		}
 		else
 		{
-			LOG_WRN("Invalid temperature threshold %d°C (valid range: 10-35°C)", new_threshold);
+			LOG_WRN("Invalid room temperature threshold %d°C (valid range: 10-35°C)", new_threshold);
+		}
+	}
+	/* Floor temperature threshold command: t2[temp] (e.g., "t2" + 22 for 22°C) */
+	else if (len > 3 && hex_data[0] == 't' && hex_data[1] == '2')
+	{
+		uint8_t new_threshold = hex_data[2];
+		if (new_threshold >= 15 && new_threshold <= 40) // Valid range 15-40°C
+		{
+			floor_temp_threshold = new_threshold;
+			relais_manual_override = false; // Re-enable automatic control
+			LOG_INF("Floor temperature threshold updated to %d°C, automatic control enabled", floor_temp_threshold);
+		}
+		else
+		{
+			LOG_WRN("Invalid floor temperature threshold %d°C (valid range: 15-40°C)", new_threshold);
 		}
 	}
 }

src/lora/lorawan.h

@@ -20,7 +20,7 @@
 						 0x0F, 0x0F}
 
 #define RETRY_DELAY K_MSEC(1000)
-#define SEND_INTERVALL K_MINUTES(5)
+#define SEND_INTERVALL K_SECONDS(20)
 
 void init_lorawan();
 

src/main.c

@@ -17,6 +17,7 @@ LOG_MODULE_REGISTER(g2h_heat_main);
 volatile bool relais_state = false;
 volatile bool relais_manual_override = false;
 volatile uint8_t temperature_threshold = 21;
+volatile uint8_t floor_temp_threshold = 22;
 
 /* MAIN */
 int main(void)
@@ -48,14 +49,23 @@ int main(void)
 
 		/* Set relais based on temperature if not manually overridden */
 		if (!relais_manual_override) {
-			if (temp < temperature_threshold) {
-				relais_state = 1;  // Heat on below threshold
+			bool temp_condition = temp < temperature_threshold;
+			bool floor_condition = true; // Default: ignore floor temp if sensor not available
+
+			// Only check floor temperature if MLX sensor is working
+			if (mlx90614_sensor_available) {
+				floor_condition = floor_temp < floor_temp_threshold;
+			}
+
+			if (temp_condition && floor_condition) {
+				relais_state = 1;  // Heat on below thresholds
 			} else {
-				relais_state = 0;  // Heat off at/above threshold
+				relais_state = 0;  // Heat off if any threshold exceeded
 			}
 			set_relais_state(relais_state);
 		}
-		printk("relais: %d (manual: %d, threshold: %d°C)\n", relais_state, relais_manual_override, temperature_threshold);
+		printk("relais: %d (manual: %d, temp_th: %d°C, floor_th: %d°C)\n",
+			relais_state, relais_manual_override, temperature_threshold, floor_temp_threshold);
 
 		/* Pack and send values */
 		char data[7];

src/sensors/mlx90614.c

@@ -8,28 +8,34 @@
 LOG_MODULE_REGISTER(mlx90614);
 
 static const struct device *i2c_dev;
-static const uint16_t i2c_addr = 0x5A;
 static uint8_t read_data_buffer[3];
+bool mlx90614_sensor_available = false;
 
-int init_mlx90614() {
+int init_mlx90614()
+{
 	i2c_dev = DEVICE_DT_GET(DT_NODELABEL(i2c1));
 
-	if (!i2c_dev) {
+	if (!i2c_dev)
+	{
 		LOG_ERR("I2C device not found!");
 		return;
-	} else {
+	}
+	else
+	{
 		LOG_INF("I2C device initialized.");
 	}
 }
 
-void request_sensor_data_mlx90614(uint8_t target_addr) {
+void request_sensor_data_mlx90614(uint8_t target_addr)
+{
 	uint8_t err;
 	for (int i = 0; i < MLX90614_RETRY_COUNT; i++)
 	{
 		err = i2c_write_read(i2c_dev, 0x5A, &target_addr, sizeof(target_addr), &read_data_buffer, sizeof(read_data_buffer));
 		if (err == 0)
 		{
-			LOG_INF("MLX90614 sensor values successfully read after %d tries", i+1);
+			LOG_INF("MLX90614 sensor values successfully read after %d tries", i + 1);
+			mlx90614_sensor_available = true;
 			return;
 		}
 		else
@@ -38,9 +44,11 @@ void request_sensor_data_mlx90614(uint8_t target_addr) {
 		}
 	}
 	LOG_ERR("MLX90614 reading sensor values failed %d times with error %d!", MLX90614_RETRY_COUNT, err);
+	mlx90614_sensor_available = false;
 }
 
-float get_temp_from_raw_data_mlx90614() {
+float get_temp_from_raw_data_mlx90614()
+{
 	int16_t temperature = (read_data_buffer[1] << 8) | read_data_buffer[0]; // Temperaturwert aus den empfangenen Daten
-	return temperature * 0.02 - 273.15; // Umrechnung in Celsius
+	return temperature * 0.02 - 273.15;										// Umrechnung in Celsius
 }

src/sensors/mlx90614.h

@@ -1,9 +1,12 @@
 #include <zephyr/kernel.h>
+#include <stdbool.h>
 
 #define MLX90614_INTERNAL_TEMP_ADDR 0x06
 #define MLX90614_IR_TEMP_ADDR 0x07
 #define MLX90614_RETRY_COUNT 5
 
+extern bool mlx90614_sensor_available;
+
 int init_mlx90614();
 
 void request_sensor_data_mlx90614(uint8_t target_addr);