fix RAK11200 variant: pin corrections and convention alignment

- Fix I2C pins in variant.h (GPIO21/22 → GPIO4/5 per datasheet)
- Fix GPS UART pins in platformio.ini (UART0 1/3 → UART1 21/19)
- Fix radio_set_tx_power signature (uint8_t → int8_t)
- Remove conflicting duplicate defines between variant.h and Board.h
(P_LORA_BUSY was RADIOLIB_NC vs 13, ADC_MULTIPLIER was 1.85 vs 5761)
- Remove stale LoRa/WisBlock defines from variant.h (Board.h is
authoritative)
- Remove "ethernet" and "can" from board JSON connectivity
- Use static SPIClass for radio init (matches Heltec V3 convention)
- Remove build_unflags=-Os (keep size optimization for 4MB flash)

Verified against RAK11200/RAK13300 datasheets

boards/wiscore_rak11200.json

@@ -13,9 +13,7 @@
   },
   "connectivity": [
     "wifi",
-    "bluetooth",
-    "ethernet",
-    "can"
+    "bluetooth"
   ],
   "frameworks": [
     "arduino",

variants/rak11200/platformio.ini

@@ -2,8 +2,6 @@
 extends = esp32_base
 board = wiscore_rak11200
 board_build.partitions = min_spiffs.csv ; get around 4mb flash limit
-build_unflags = -Os
-build_type = release
 build_flags =
   ${esp32_base.build_flags}
   ${sensor_base.build_flags}
@@ -12,8 +10,8 @@ build_flags =
   -D RAK_BOARD
   -D PIN_BOARD_SCL=5
   -D PIN_BOARD_SDA=4
-  -D PIN_GPS_TX=1
-  -D PIN_GPS_RX=3
+  -D PIN_GPS_TX=21
+  -D PIN_GPS_RX=19
   -D PIN_GPS_EN=-1
   -D PIN_OLED_RESET=-1
   -D RADIO_CLASS=CustomSX1262

variants/rak11200/target.cpp

@@ -17,7 +17,12 @@ RAK11200Board board;
   #endif
 #endif
 
-RADIO_CLASS radio = new Module(P_LORA_NSS, P_LORA_DIO_1, P_LORA_RESET, P_LORA_BUSY, SPI);
+#if defined(P_LORA_SCLK)
+  static SPIClass spi;
+  RADIO_CLASS radio = new Module(P_LORA_NSS, P_LORA_DIO_1, P_LORA_RESET, P_LORA_BUSY, spi);
+#else
+  RADIO_CLASS radio = new Module(P_LORA_NSS, P_LORA_DIO_1, P_LORA_RESET, P_LORA_BUSY);
+#endif
 
 WRAPPER_CLASS radio_driver(radio, board);
 
@@ -36,7 +41,7 @@ bool radio_init() {
   rtc_clock.begin(Wire);
 
   #if defined(P_LORA_SCLK)
-    return radio.std_init(&SPI);
+    return radio.std_init(&spi);
   #else
     return radio.std_init();
   #endif
@@ -53,7 +58,7 @@ void radio_set_params(float freq, float bw, uint8_t sf, uint8_t cr) {
   radio.setCodingRate(cr);
 }
 
-void radio_set_tx_power(uint8_t dbm) {
+void radio_set_tx_power(int8_t dbm) {
   radio.setOutputPower(dbm);
 }
 

variants/rak11200/target.h

@@ -23,5 +23,5 @@ extern EnvironmentSensorManager sensors;
 bool radio_init();
 uint32_t radio_get_rng_seed();
 void radio_set_params(float freq, float bw, uint8_t sf, uint8_t cr);
-void radio_set_tx_power(uint8_t dbm);
+void radio_set_tx_power(int8_t dbm);
 mesh::LocalIdentity radio_new_identity();

variants/rak11200/variant.h

@@ -1,63 +1,26 @@
 #pragma once
 
 // RAK11200 WisBlock ESP32 Pin Definitions
+// Reference: https://docs.rakwireless.com/Product-Categories/WisBlock/RAK11200/Datasheet/
+// Reference: https://docs.rakwireless.com/Product-Categories/WisBlock/RAK13300/Datasheet/
 
-// I2C Interface (Main board I2C)
-#define I2C_SDA 21
-#define I2C_SCL 22
+// I2C Interface (I2C1 on WisBlock connector pins 19/20)
+#define I2C_SDA 4   // GPIO4
+#define I2C_SCL 5   // GPIO5
 
-// GPS Interface
-#define GPS_TX_PIN 1
-#define GPS_RX_PIN 3
+// GPS Interface (UART1)
+#define GPS_TX_PIN 21
+#define GPS_RX_PIN 19
 #define PIN_GPS_EN -1
-#define GPS_POWER_TOGGLE
 #define GPS_BAUD_RATE 9600
 
 // User Interface
 #define BUTTON_PIN 34       // WB_SW1 - User button
 #define BATTERY_PIN 36      // WB_A0 - Battery voltage measurement pin
 #define ADC_CHANNEL ADC1_GPIO36_CHANNEL
-#define ADC_MULTIPLIER 1.85 // Adjust based on voltage divider
 #define LED_PIN 12          // WB_LED1 - Status LED
 #define LED_PIN_2 2         // WB_LED2 - Secondary LED
 
-// LoRa radio module pins for RAK11200 + RAK13300 SX1262
-#define P_LORA_DIO_1   22   // WB_IO6 - DIO1 interrupt pin
-#define P_LORA_NSS     32   // WB_CS - SPI Chip Select
-#define P_LORA_RESET   23   // WB_IO4 - Reset pin
-#define P_LORA_BUSY    RADIOLIB_NC  // Not connected - using DIO2 for RF switching
-#define P_LORA_SCLK    33   // SPI Clock
-#define P_LORA_MISO    35   // SPI MISO
-#define P_LORA_MOSI    25   // SPI MOSI
-
-// LoRa radio configuration
-#define USE_SX1262
-#define SX126X_MAX_POWER 22
-#define SX126X_DIO2_AS_RF_SWITCH true
-#define SX126X_DIO3_TCXO_VOLTAGE 1.8
-#define SX126X_CURRENT_LIMIT 140
-
-// Compatibility defines for variant file configuration structure
-#define LORA_CS P_LORA_NSS
-#define LORA_SCK P_LORA_SCLK
-#define LORA_MOSI P_LORA_MOSI
-#define LORA_MISO P_LORA_MISO
-#define LORA_DIO1 P_LORA_DIO_1
-
-// WisBlock GPIO mapping for RAK11200
-#define WB_IO1 14    // GPIO14
-#define WB_IO2 27    // GPIO27
-#define WB_IO3 26    // GPIO26
-#define WB_IO4 23    // GPIO23
-#define WB_IO5 13    // GPIO13
-#define WB_IO6 22    // GPIO22
-#define WB_SW1 34    // GPIO34 - Switch/Button
-#define WB_A0  36    // GPIO36 - Analog input
-#define WB_A1  39    // GPIO39 - Analog input
-#define WB_CS  32    // GPIO32 - SPI Chip Select
-#define WB_LED1 12   // GPIO12 - LED1
-#define WB_LED2 2    // GPIO2  - LED2
-
 // Board identification
 #define RAK_11200
 #define RAK_BOARD