Initial commit: Simple Sensor firmware for Heltec T114 with BME280

- MeshCore-based Simple Sensor firmware
- Heltec T114 without display
- BME280 sensor support (temp/humidity/pressure)
- Radio: 868.856018 MHz, SF7, BW62.5 kHz, CR4/7
- 2-byte path hash
- PlatformIO project

variants/xiao_c6/XiaoC6Board.cpp

@@ -0,0 +1,51 @@
+#include <Arduino.h>
+#include "target.h"
+
+XiaoC6Board board;
+
+#if defined(P_LORA_SCLK)
+  static SPIClass spi(0);
+  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);
+
+ESP32RTCClock fallback_clock;
+AutoDiscoverRTCClock rtc_clock(fallback_clock);
+SensorManager sensors;
+
+bool radio_init() {
+  fallback_clock.begin();
+  rtc_clock.begin(Wire);
+
+#if defined(P_LORA_SCLK)
+  spi.begin(P_LORA_SCLK, P_LORA_MISO, P_LORA_MOSI);
+  return radio.std_init(&spi);
+#else
+  return radio.std_init();
+#endif
+}
+
+uint32_t radio_get_rng_seed() {
+  return radio.random(0x7FFFFFFF);
+}
+
+void radio_set_params(float freq, float bw, uint8_t sf, uint8_t cr) {
+  radio.setFrequency(freq);
+  radio.setSpreadingFactor(sf);
+  radio.setBandwidth(bw);
+  radio.setCodingRate(cr);
+}
+
+void radio_set_tx_power(int8_t dbm) {
+  radio.setOutputPower(dbm);
+}
+
+mesh::LocalIdentity radio_new_identity() {
+  RadioNoiseListener rng(radio);
+  return mesh::LocalIdentity(&rng);  // create new random identity
+}
+
+

variants/xiao_c6/XiaoC6Board.h

@@ -0,0 +1,28 @@
+#pragma once
+
+#include <Arduino.h>
+#include <helpers/ESP32Board.h>
+
+class XiaoC6Board : public ESP32Board {
+public:
+  void begin() {
+    ESP32Board::begin();
+
+#ifdef USE_XIAO_ESP32C6_EXTERNAL_ANTENNA
+// Connect an external antenna to your XIAO ESP32C6 otherwise, it may be damaged!
+    pinMode(3, OUTPUT);
+    digitalWrite(3, LOW); // Activate RF switch control
+
+    delay(100);
+
+    pinMode(14, OUTPUT);
+    digitalWrite(14, HIGH); // Use external antenna
+#endif
+  }
+
+  const char* getManufacturerName() const override {
+    return "Xiao C6";
+  }
+};
+
+

variants/xiao_c6/platformio.ini

@@ -0,0 +1,186 @@
+[Xiao_C6]
+extends = esp32c6_base
+board = esp32-c6-devkitm-1
+board_build.partitions = min_spiffs.csv ; get around 4mb flash limit
+build_flags =
+  ${esp32c6_base.build_flags}
+  -I variants/xiao_c6
+  -D ARDUINO_USB_CDC_ON_BOOT=1
+  -D ARDUINO_USB_MODE=1
+  -D P_LORA_TX_LED=15
+  -D P_LORA_SCLK=19
+  -D P_LORA_MISO=20
+  -D P_LORA_MOSI=18
+  -D P_LORA_NSS=22
+  -D P_LORA_DIO_1=1
+  -D P_LORA_BUSY=21
+  -D P_LORA_RESET=2
+  -D PIN_BOARD_SDA=16
+  -D PIN_BOARD_SCL=17
+  -D SX126X_RXEN=23
+  -D SX126X_DIO2_AS_RF_SWITCH=true
+  -D SX126X_DIO3_TCXO_VOLTAGE=1.8
+  -D SX126X_CURRENT_LIMIT=140
+  -D SX126X_RX_BOOSTED_GAIN=1
+  -D USE_SX1262
+  -D RADIO_CLASS=CustomSX1262
+  -D WRAPPER_CLASS=CustomSX1262Wrapper
+  -D LORA_TX_POWER=22
+  -D DISABLE_WIFI_OTA=1
+build_src_filter = ${esp32c6_base.build_src_filter}
+  +<../variants/xiao_c6>
+  +<XiaoC6Board.cpp>
+
+[env:Xiao_C6_repeater_]
+extends = Xiao_C6
+build_src_filter = ${Xiao_C6.build_src_filter}
+  +<../examples/simple_repeater/*.cpp>
+build_flags =
+  ${Xiao_C6.build_flags}
+  -D ADVERT_NAME='"Xiao C6 Repeater"'
+  -D ADVERT_LAT=0.0
+  -D ADVERT_LON=0.0
+  -D ADMIN_PASSWORD='"password"'
+  -D MAX_NEIGHBOURS=50
+;  -D MESH_PACKET_LOGGING=1
+;  -D MESH_DEBUG=1
+lib_deps =
+  ${Xiao_C6.lib_deps}
+  ${esp32_ota.lib_deps}
+
+[env:Xiao_C6_companion_radio_ble_]
+extends = Xiao_C6
+build_flags = ${Xiao_C6.build_flags}
+  -D MAX_CONTACTS=350
+  -D MAX_GROUP_CHANNELS=40
+  -D BLE_PIN_CODE=123456
+  -D BLE_DEBUG_LOGGING=1
+  -D OFFLINE_QUEUE_SIZE=256
+  -D ENABLE_PRIVATE_KEY_IMPORT=1
+  -D ENABLE_PRIVATE_KEY_EXPORT=1
+;  -D MESH_PACKET_LOGGING=1
+;  -D MESH_DEBUG=1
+build_src_filter = ${Xiao_C6.build_src_filter}
+  +<helpers/esp32/*.cpp>
+  -<helpers/esp32/ESPNOWRadio.cpp>
+  +<../examples/companion_radio/*.cpp>
+lib_deps =
+  ${Xiao_C6.lib_deps}
+  densaugeo/base64 @ ~1.4.0
+
+; Meshimi variant
+[Meshimi]
+extends = Xiao_C6
+board_build.partitions = max_app_4MB.csv
+build_flags =
+  ${Xiao_C6.build_flags}
+  -D P_LORA_TX_LED=15
+  -D P_LORA_SCLK=19
+  -D P_LORA_MISO=20
+  -D P_LORA_MOSI=18
+  -D P_LORA_NSS=21
+  -D P_LORA_DIO_1=7
+  -D P_LORA_BUSY=6
+  -D P_LORA_RESET=2
+  -D PIN_BOARD_SDA=22
+  -D PIN_BOARD_SCL=23
+  -D SX126X_RXEN=4
+  -D SX126X_DIO2_AS_RF_SWITCH=true
+  -D SX126X_DIO3_TCXO_VOLTAGE=1.8
+  -D SX126X_CURRENT_LIMIT=140
+  -D SX126X_RX_BOOSTED_GAIN=1
+  -D USE_XIAO_ESP32C6_EXTERNAL_ANTENNA=1
+
+[env:Meshimi_repeater_]
+extends = Meshimi
+build_src_filter = ${Meshimi.build_src_filter}
+  +<../examples/simple_repeater/*.cpp>
+build_flags =
+  ${Meshimi.build_flags}
+  -D ADVERT_NAME='"Meshimi Repeater"'
+  -D ADVERT_LAT=0.0
+  -D ADVERT_LON=0.0
+  -D ADMIN_PASSWORD='"password"'
+  -D MAX_NEIGHBOURS=50
+lib_deps =
+  ${Meshimi.lib_deps}
+
+[env:Meshimi_companion_radio_ble_]
+extends = Meshimi
+build_flags = ${Meshimi.build_flags}
+  -D MAX_CONTACTS=350
+  -D MAX_GROUP_CHANNELS=40
+  -D BLE_PIN_CODE=123456
+  -D BLE_DEBUG_LOGGING=1
+  -D OFFLINE_QUEUE_SIZE=256
+  -D ENABLE_PRIVATE_KEY_IMPORT=1
+  -D ENABLE_PRIVATE_KEY_EXPORT=1
+build_src_filter = ${Meshimi.build_src_filter}
+  +<helpers/esp32/*.cpp>
+  -<helpers/esp32/ESPNOWRadio.cpp>
+  +<../examples/companion_radio/*.cpp>
+lib_deps =
+  ${Meshimi.lib_deps}
+  densaugeo/base64 @ ~1.4.0
+
+; WHY2025 badge variant
+; requires soldering 2 pins between the esp32-C6 and the lora chip as shown here: https://wiki.why2025.org/Project:Meshtastic_on_the_WHY2025_badge
+; also requires wiping the esp32-P4
+[WHY2025_badge]
+extends = Xiao_C6
+board_build.partitions = default_8MB.csv
+board_upload.flash_size = 8MB
+board_upload.maximum_size = 8388608
+build_flags =
+  ${Xiao_C6.build_flags}
+  -D P_LORA_SCLK=6
+  -D P_LORA_MISO=2
+  -D P_LORA_MOSI=7
+  -D P_LORA_NSS=4
+  -D P_LORA_DIO_1=5
+  -D P_LORA_BUSY=11
+  -D P_LORA_RESET=1
+  -D SX126X_TXEN=3
+  -UPIN_BOARD_SDA
+  -UPIN_BOARD_SCL
+  -UP_LORA_TX_LED
+  -USX126X_RXEN
+  -USX126X_DIO2_AS_RF_SWITCH
+  -USX126X_DIO3_TCXO_VOLTAGE
+
+[env:WHY2025_badge_repeater_]
+extends = WHY2025_badge
+build_src_filter = ${WHY2025_badge.build_src_filter}
+  +<../examples/simple_repeater/*.cpp>
+build_flags =
+  ${WHY2025_badge.build_flags}
+  -D ADVERT_NAME='"WHY2025 Badge Repeater"'
+  -D ADVERT_LAT=0.0
+  -D ADVERT_LON=0.0
+  -D ADMIN_PASSWORD='"password"'
+  -D MAX_NEIGHBOURS=50
+;  -D MESH_PACKET_LOGGING=1
+;  -D MESH_DEBUG=1
+lib_deps =
+  ${WHY2025_badge.lib_deps}
+  ${esp32_ota.lib_deps}
+
+[env:WHY2025_badge_companion_radio_ble_]
+extends = WHY2025_badge
+build_flags = ${WHY2025_badge.build_flags}
+  -D MAX_CONTACTS=350
+  -D MAX_GROUP_CHANNELS=40
+  -D BLE_PIN_CODE=123456
+  -D BLE_DEBUG_LOGGING=1
+  -D OFFLINE_QUEUE_SIZE=256
+  -D ENABLE_PRIVATE_KEY_IMPORT=1
+  -D ENABLE_PRIVATE_KEY_EXPORT=1
+;  -D MESH_PACKET_LOGGING=1
+;  -D MESH_DEBUG=1
+build_src_filter = ${WHY2025_badge.build_src_filter}
+  +<helpers/esp32/*.cpp>
+  -<helpers/esp32/ESPNOWRadio.cpp>
+  +<../examples/companion_radio/*.cpp>
+lib_deps =
+  ${WHY2025_badge.lib_deps}
+  densaugeo/base64 @ ~1.4.0

variants/xiao_c6/target.h

@@ -0,0 +1,22 @@
+#pragma once
+
+#define RADIOLIB_STATIC_ONLY 1
+#include <RadioLib.h>
+#include <XiaoC6Board.h>
+#include <helpers/radiolib/RadioLibWrappers.h>
+#include <helpers/ESP32Board.h>
+#include <helpers/radiolib/CustomSX1262Wrapper.h>
+#include <helpers/AutoDiscoverRTCClock.h>
+#include <helpers/SensorManager.h>
+
+extern XiaoC6Board board;
+extern WRAPPER_CLASS radio_driver;
+extern AutoDiscoverRTCClock rtc_clock;
+extern SensorManager 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(int8_t dbm);
+mesh::LocalIdentity radio_new_identity();
+