Add Elecrow ThinkNode G3 room server variant

variants/thinknode_g3/ThinkNodeG3Board.h

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+#pragma once
+
+#include <helpers/ESP32Board.h>
+
+// G3 LoRa LED on GPIO 6 is active-low. ESP32Board drives the TX LED
+// high for on, which leaves this board's LED lit at idle.
+class ThinkNodeG3Board : public ESP32Board {
+public:
+  void begin() {
+    ESP32Board::begin();
+#ifdef P_LORA_TX_LED
+    digitalWrite(P_LORA_TX_LED, HIGH); // idle = off
+#endif
+  }
+
+#ifdef P_LORA_TX_LED
+  void onBeforeTransmit() override {
+    digitalWrite(P_LORA_TX_LED, LOW);
+  }
+
+  void onAfterTransmit() override {
+    digitalWrite(P_LORA_TX_LED, HIGH);
+  }
+#endif
+};

variants/thinknode_g3/pins_arduino.h

@@ -0,0 +1,18 @@
+#ifndef Pins_Arduino_h
+#define Pins_Arduino_h
+
+#include <stdint.h>
+
+#define USB_VID 0x303a
+#define USB_PID 0x1001
+
+static const uint8_t SDA  = 17;
+static const uint8_t SCL  = 18;
+
+// Default SPI is the SX1262, not the CH390.
+static const uint8_t SS   = 39;
+static const uint8_t MOSI = 40;
+static const uint8_t MISO = 41;
+static const uint8_t SCK  = 42;
+
+#endif

variants/thinknode_g3/platformio.ini

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+; Elecrow ThinkNode G3 (ILM13103D) — ESP32-S3-WROOM-1-N8R8 + LR1262 (SX1262)
+;
+; Drop this directory in as variants/thinknode_g3/ of a MeshCore checkout.
+; MeshCore loads every variants/*/platformio.ini automatically.
+;
+; Radio map recovered from a stock Elecrow US915 flash dump (nsbradley88,
+; meshtastic/firmware discussion #9434, 2026-09-23), then confirmed on air
+; as a Meshtastic node with TCXO at 3.0 V. Not yet confirmed under MeshCore.
+;
+; Do not copy ThinkNode M7 pins. M7 is an LR1110 + different PCB.
+; Ethernet is intentionally omitted: the CH390 SPI pins are not confirmed,
+; and M7's ETH pins collide with this radio (BUSY is GPIO 47 here).
+
+[ThinkNode_G3]
+extends = esp32_base
+board = esp32-s3-devkitc-1
+board_build.flash_size = 8MB
+board_upload.flash_size = 8MB
+board_build.partitions = default_8MB.csv
+board_build.arduino.memory_type = qio_opi
+board_build.flash_mode = qio
+board_build.psram_type = opi
+upload_speed = 115200
+; CH340 USB-UART, no auto-reset wiring. Hold BOOT, tap RST, release BOOT.
+upload_flags =
+  --before=no_reset
+  --no-stub
+build_flags = ${esp32_base.build_flags}
+  -I variants/thinknode_g3
+  -D THINKNODE_G3
+  -D BOARD_HAS_PSRAM
+  ; Radio — stock firmware tables @ 0x38244 / 0x3826c
+  -D USE_SX1262
+  -D RADIO_CLASS=CustomSX1262
+  -D WRAPPER_CLASS=CustomSX1262Wrapper
+  -D P_LORA_NSS=39
+  -D P_LORA_SCLK=42
+  -D P_LORA_MOSI=40
+  -D P_LORA_MISO=41
+  -D P_LORA_RESET=21
+  -D P_LORA_BUSY=47
+  -D P_LORA_DIO_1=15
+  -D P_LORA_EN=45
+  -D SX126X_DIO2_AS_RF_SWITCH=true
+  -D SX126X_DIO3_TCXO_VOLTAGE=3.0
+  -D SX126X_CURRENT_LIMIT=140
+  -D SX126X_RX_BOOSTED_GAIN=1
+  -D LORA_TX_POWER=22
+  ; Front panel. Reload = GPIO 4, LINK LED = 5, LoRa LED = 6.
+  -D PIN_USER_BTN=4
+  -D PIN_STATUS_LED=5
+  -D P_LORA_TX_LED=6
+  -D LED_STATE_ON=HIGH
+  ; I2C brought out in the early Meshtastic variant; unused by stock firmware.
+  -D PIN_BOARD_SDA=17
+  -D PIN_BOARD_SCL=18
+build_src_filter = ${esp32_base.build_src_filter}
+  +<../variants/thinknode_g3>
+
+[env:ThinkNode_G3_repeater]
+extends = ThinkNode_G3
+build_src_filter = ${ThinkNode_G3.build_src_filter}
+  +<../examples/simple_repeater/*.cpp>
+build_flags =
+  ${ThinkNode_G3.build_flags}
+  -D ADVERT_NAME='"ThinkNode G3 Repeater"'
+  -D ADVERT_LAT=0.0
+  -D ADVERT_LON=0.0
+  -D ADMIN_PASSWORD='"#P@$sw0rd123456"'
+  -D MAX_NEIGHBOURS=50
+lib_deps =
+  ${esp32_base.lib_deps}
+  ${esp32_ota.lib_deps}
+
+[env:ThinkNode_G3_room_server]
+extends = ThinkNode_G3
+build_src_filter = ${ThinkNode_G3.build_src_filter}
+  +<../examples/simple_room_server>
+build_flags =
+  ${ThinkNode_G3.build_flags}
+  -D ADVERT_NAME='"ThinkNode G3 Room"'
+  -D ADVERT_LAT=0.0
+  -D ADVERT_LON=0.0
+  -D ADMIN_PASSWORD='"#P@$sw0rd123456"'
+  -D ROOM_PASSWORD='"hellno"'
+lib_deps =
+  ${esp32_base.lib_deps}
+  ${esp32_ota.lib_deps}
+
+[env:ThinkNode_G3_companion_radio_ble]
+extends = ThinkNode_G3
+build_flags =
+  ${ThinkNode_G3.build_flags}
+  -I examples/companion_radio/ui-orig
+  -D DISPLAY_CLASS=NullDisplayDriver
+  -D MAX_CONTACTS=350
+  -D MAX_GROUP_CHANNELS=40
+  -D BLE_PIN_CODE=123456
+  -D OFFLINE_QUEUE_SIZE=256
+build_src_filter = ${ThinkNode_G3.build_src_filter}
+  +<helpers/esp32/*.cpp>
+  +<helpers/ui/MomentaryButton.cpp>
+  +<helpers/ui/NullDisplayDriver.cpp>
+  +<../examples/companion_radio/*.cpp>
+  +<../examples/companion_radio/ui-orig/*.cpp>
+lib_deps =
+  ${esp32_base.lib_deps}
+  densaugeo/base64 @ ~1.4.0
+
+[env:ThinkNode_G3_companion_radio_usb]
+extends = ThinkNode_G3
+build_flags =
+  ${ThinkNode_G3.build_flags}
+  -I examples/companion_radio/ui-orig
+  -D MAX_CONTACTS=350
+  -D MAX_GROUP_CHANNELS=40
+  -D OFFLINE_QUEUE_SIZE=256
+  -D ENABLE_USB_INTERFACE
+build_src_filter = ${ThinkNode_G3.build_src_filter}
+  +<helpers/esp32/*.cpp>
+  +<helpers/ui/MomentaryButton.cpp>
+  +<../examples/companion_radio/*.cpp>
+  +<../examples/companion_radio/ui-orig/*.cpp>
+lib_deps =
+  ${esp32_base.lib_deps}
+  densaugeo/base64 @ ~1.4.0

variants/thinknode_g3/target.cpp

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+#include <Arduino.h>
+#include "target.h"
+
+ThinkNodeG3Board board;
+
+static SPIClass spi;
+RADIO_CLASS radio = new Module(P_LORA_NSS, P_LORA_DIO_1, P_LORA_RESET, P_LORA_BUSY, spi);
+WRAPPER_CLASS radio_driver(radio, board);
+
+ESP32RTCClock fallback_clock;
+AutoDiscoverRTCClock rtc_clock(fallback_clock);
+SensorManager sensors;
+
+bool radio_init() {
+  // Stock firmware drives GPIO 45 high once at init (antenna switch / PE_EN).
+  // ESP32Board does not know about P_LORA_EN, so do it here before radio begin.
+#ifdef P_LORA_EN
+  pinMode(P_LORA_EN, OUTPUT);
+  digitalWrite(P_LORA_EN, HIGH);
+#endif
+
+  fallback_clock.begin();
+  rtc_clock.begin(Wire);
+  return radio.std_init(&spi);
+}
+
+mesh::LocalIdentity radio_new_identity() {
+  RadioNoiseListener rng(radio);
+  return mesh::LocalIdentity(&rng);
+}

variants/thinknode_g3/target.h

@@ -0,0 +1,17 @@
+#pragma once
+
+#define RADIOLIB_STATIC_ONLY 1
+#include <RadioLib.h>
+#include <helpers/radiolib/RadioLibWrappers.h>
+#include <ThinkNodeG3Board.h>
+#include <helpers/radiolib/CustomSX1262Wrapper.h>
+#include <helpers/AutoDiscoverRTCClock.h>
+#include <helpers/SensorManager.h>
+
+extern ThinkNodeG3Board board;
+extern WRAPPER_CLASS radio_driver;
+extern AutoDiscoverRTCClock rtc_clock;
+extern SensorManager sensors;
+
+bool radio_init();
+mesh::LocalIdentity radio_new_identity();

variants/thinknode_g3/variant.h

@@ -0,0 +1,28 @@
+#pragma once
+
+// Elecrow ThinkNode G3 (ILM13103D)
+// ESP32-S3-WROOM-1-N8R8, LR1262 module (SX1262 + TCXO + RF switch)
+//
+// Pin values recovered from stock Elecrow firmware constants, not from a
+// published schematic. Confirm against your own flash dump before flashing.
+
+#define P_LORA_NSS    39
+#define P_LORA_SCLK   42
+#define P_LORA_MOSI   40
+#define P_LORA_MISO   41
+#define P_LORA_RESET  21
+#define P_LORA_BUSY   47
+#define P_LORA_DIO_1  15
+
+// Stock firmware drives this high once at init (antenna_sw / PE_EN).
+#define P_LORA_EN     45
+
+#define PIN_USER_BTN    4   // Reload, silk K2
+#define PIN_STATUS_LED  5   // LINK, green
+#define P_LORA_TX_LED   6   // LoRa LED
+
+#define PIN_BOARD_SDA  17
+#define PIN_BOARD_SCL  18
+
+// USB D-/D+ are GPIO 19/20. Do not reuse.
+// BOOT is WROOM IO0. Do not use as a radio pin.