Add initial ESP32 controller firmware

firmware/esp32/xterra-controller/config.h

@@ -0,0 +1,18 @@
+#pragma once
+
+#define DEVICE_NAME "Xterra Controller"
+
+// Relay Outputs
+#define RELAY_STARLINK_PIN 16
+#define RELAY_FRIDGE_PIN   17
+
+// DS18B20 Bus
+#define ONEWIRE_PIN 4
+
+// Ignition Sense
+#define IGNITION_PIN 34
+
+// Future RS485
+#define RS485_TX_PIN 21
+#define RS485_RX_PIN 22
+#define RS485_DE_PIN 23