feat: New ESP32 variant 9m2ibr_aprs_lora_tracker

9M2IBR APRS LoRa Tracker: ESP32-WROOM-32 + EBYTE E22-400M30S
https://shopee.com.my/product/1095224/21692283917

Originally developed for LoRa_APRS_iGate and GPIO assignment is similar to https://github.com/richonguzman/LoRa_APRS_iGate/blob/main/variants/ESP32_DIY_1W_LoRa_Mesh_V1_2/board_pinout.h

Signed-off-by: Andrew Yong <me@ndoo.sg>

variants/esp32/diy/9m2ibr_aprs_lora_tracker/platformio.ini

@@ -0,0 +1,12 @@
+; 9M2IBR APRS LoRa Tracker: ESP32-WROOM-32 + EBYTE E22-400M30S
+; https://shopee.com.my/product/1095224/21692283917
+[env:9m2ibr_aprs_lora_tracker]
+extends = esp32_base
+board = esp32doit-devkit-v1
+board_level = extra
+build_flags =
+  ${esp32_base.build_flags}
+  -D PRIVATE_HW
+  -D EBYTE_E22
+  -D EBYTE_E22_900M30S ; Assume Tx power curve is identical to 900M30S as there is no documentation
+  -I variants/esp32/diy/9m2ibr_aprs_lora_tracker

variants/esp32/diy/9m2ibr_aprs_lora_tracker/variant.h

@@ -0,0 +1,74 @@
+/*
+
+  9M2IBR APRS LoRa Tracker: ESP32-WROOM-32 + EBYTE E22-400M30S
+  https://shopee.com.my/product/1095224/21692283917
+
+  Originally developed for LoRa_APRS_iGate and GPIO is similar to
+  https://github.com/richonguzman/LoRa_APRS_iGate/blob/main/variants/ESP32_DIY_1W_LoRa_Mesh_V1_2/board_pinout.h
+
+*/
+
+// OLED (may be different controllers depending on screen size)
+#define I2C_SDA 21
+#define I2C_SCL 22
+#define HAS_SCREEN 1 // Generates randomized BLE pin
+
+// GNSS: Ai-Thinker GP-02 BDS/GNSS module
+#define GPS_RX_PIN 16
+#define GPS_TX_PIN 17
+
+// Button
+#define BUTTON_PIN 15 // Right side button - if not available, set device.button_gpio to 0 from Meshtastic client
+
+// LEDs
+#define LED_PIN 13 // Tx LED
+#define USER_LED 2 // Rx LED
+
+// Buzzer
+#define PIN_BUZZER 33
+
+// Battery sense
+#define BATTERY_PIN 35
+#define ADC_MULTIPLIER 2.01 // 100k + 100k, and add 1% tolerance
+#define ADC_CHANNEL ADC1_GPIO35_CHANNEL
+#define BATTERY_SENSE_RESOLUTION_BITS ADC_RESOLUTION
+
+// SPI
+#define LORA_SCK 18
+#define LORA_MISO 19
+#define LORA_MOSI 23
+
+// LoRa
+#define LORA_CS 5
+#define LORA_DIO0 26          // a No connect on the SX1262/SX1268 module
+#define LORA_RESET 27         // RST for SX1276, and for SX1262/SX1268
+#define LORA_DIO1 12          // IRQ for SX1262/SX1268
+#define LORA_DIO2 RADIOLIB_NC // BUSY for SX1262/SX1268
+#define LORA_DIO3             // NC, but used as TCXO supply by E22 module
+#define LORA_RXEN 32          // RF switch RX (and E22 LNA) control by ESP32 GPIO
+#define LORA_TXEN 25          // RF switch TX (and E22 PA) control by ESP32 GPIO
+
+// RX/TX for RFM95/SX127x
+#define RF95_RXEN LORA_RXEN
+#define RF95_TXEN LORA_TXEN
+// #define RF95_TCXO <GPIO#>
+
+// common pinouts for SX126X modules
+#define SX126X_CS 5
+#define SX126X_DIO1 LORA_DIO1
+#define SX126X_BUSY LORA_DIO2
+#define SX126X_RESET LORA_RESET
+#define SX126X_RXEN LORA_RXEN
+#define SX126X_TXEN LORA_TXEN
+
+// Support alternative modules if soldered in place of E22
+#define USE_RF95 // RFM95/SX127x
+#define USE_SX1262
+#define USE_SX1268
+#define USE_LLCC68
+
+// E22 TCXO support
+#ifdef EBYTE_E22
+#define SX126X_DIO3_TCXO_VOLTAGE 1.8
+#define TCXO_OPTIONAL // make it so that the firmware can try both TCXO and XTAL
+#endif