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/generic_espnow/platformio.ini

@@ -0,0 +1,81 @@
+
+; ----------- Generic ESP32-C3 ------------
+
+[Generic_ESPNOW]
+extends = esp32_base
+board = esp32-c3-devkitm-1
+;board = esp32-s3-devkitm-1
+build_flags =
+  ${esp32_base.build_flags}
+  -I variants/generic_espnow
+;  -D ESP32_CPU_FREQ=80
+  -D PIN_BOARD_SDA=-1
+  -D PIN_BOARD_SCL=-1
+;  -D P_LORA_TX_LED=8
+  -D PIN_USER_BTN=0
+;  -D ARDUINO_USB_MODE=1
+;  -D ARDUINO_USB_CDC_ON_BOOT=1
+;  -D ESPNOW_DEBUG_LOGGING=1
+;  -D MESH_PACKET_LOGGING=1
+;  -D MESH_DEBUG=1
+build_src_filter = ${esp32_base.build_src_filter}
+  +<helpers/esp32/ESPNOWRadio.cpp>
+  +<../variants/generic_espnow>
+
+[env:Generic_ESPNOW_terminal_chat]
+extends = Generic_ESPNOW
+build_flags =
+  ${Generic_ESPNOW.build_flags}
+  -D MAX_CONTACTS=350
+  -D MAX_GROUP_CHANNELS=1
+build_src_filter = ${Generic_ESPNOW.build_src_filter}
+  +<../examples/simple_secure_chat/main.cpp>
+lib_deps =
+  ${Generic_ESPNOW.lib_deps}
+  densaugeo/base64 @ ~1.4.0
+
+[env:Generic_ESPNOW_repeatr]
+extends = Generic_ESPNOW
+build_flags =
+  ${Generic_ESPNOW.build_flags}
+  -D ADVERT_NAME='"ESPNOW Repeater"'
+  -D ADVERT_LAT=0.0
+  -D ADVERT_LON=0.0
+  -D ADMIN_PASSWORD='"password"'
+  -D MAX_NEIGHBOURS=50
+build_src_filter = ${Generic_ESPNOW.build_src_filter}
+  +<../examples/simple_repeater/*.cpp>
+lib_deps =
+  ${Generic_ESPNOW.lib_deps}
+  ${esp32_ota.lib_deps}
+  densaugeo/base64 @ ~1.4.0
+
+[env:Generic_ESPNOW_comp_radio_usb]
+extends = Generic_ESPNOW
+build_flags =
+  ${Generic_ESPNOW.build_flags}
+  -D MAX_CONTACTS=350
+  -D MAX_GROUP_CHANNELS=8
+; NOTE: DO NOT ENABLE -->  -D MESH_PACKET_LOGGING=1
+; NOTE: DO NOT ENABLE -->  -D MESH_DEBUG=1
+; NOTE: DO NOT ENABLE -->  -D ESPNOW_DEBUG_LOGGING=1
+build_src_filter = ${Generic_ESPNOW.build_src_filter}
+  +<../examples/companion_radio/*.cpp>
+lib_deps =
+  ${Generic_ESPNOW.lib_deps}
+  densaugeo/base64 @ ~1.4.0
+
+[env:Generic_ESPNOW_room_svr]
+extends = Generic_ESPNOW
+build_flags =
+  ${Generic_ESPNOW.build_flags}
+  -D ADVERT_NAME='"Generic ESPNow Room"'
+  -D ADVERT_LAT=0.0
+  -D ADVERT_LON=0.0
+  -D ADMIN_PASSWORD='"password"'
+  -D ROOM_PASSWORD='"hello"'
+build_src_filter = ${Generic_ESPNOW.build_src_filter}
+  +<../examples/simple_room_server/*.cpp>
+lib_deps =
+  ${Generic_ESPNOW.lib_deps}
+  ${esp32_ota.lib_deps}

variants/generic_espnow/target.cpp

@@ -0,0 +1,44 @@
+#include <Arduino.h>
+#include "target.h"
+#include <helpers/ArduinoHelpers.h>
+
+ESP32Board board;
+
+ESPNOWRadio radio_driver;
+
+ESP32RTCClock rtc_clock;
+SensorManager sensors;
+
+bool radio_init() {
+  rtc_clock.begin();
+
+  radio_driver.init();
+
+  return true;  // success
+}
+
+uint32_t radio_get_rng_seed() {
+  return millis() + radio_driver.intID();  // TODO: where to get some entropy?
+}
+
+void radio_set_params(float freq, float bw, uint8_t sf, uint8_t cr) {
+  // no-op
+}
+
+void radio_set_tx_power(int8_t dbm) {
+  radio_driver.setTxPower(dbm);
+}
+
+// NOTE: as we are using the WiFi radio, the ESP_IDF will have enabled hardware RNG:
+//    https://docs.espressif.com/projects/esp-idf/en/stable/esp32/api-reference/system/random.html
+class ESP_RNG : public mesh::RNG {
+public:
+  void random(uint8_t* dest, size_t sz) override {
+    esp_fill_random(dest, sz);
+  }
+};
+
+mesh::LocalIdentity radio_new_identity() {
+  ESP_RNG rng;
+  return mesh::LocalIdentity(&rng);  // create new random identity
+}

variants/generic_espnow/target.h

@@ -0,0 +1,16 @@
+#pragma once
+
+#include <helpers/ESP32Board.h>
+#include <helpers/esp32/ESPNOWRadio.h>
+#include <helpers/SensorManager.h>
+
+extern ESP32Board board;
+extern ESPNOWRadio radio_driver;
+extern ESP32RTCClock 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();