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This directory is intended for project header files.
A header file is a file containing C declarations and macro definitions
to be shared between several project source files. You request the use of a
header file in your project source file (C, C++, etc) located in `src` folder
by including it, with the C preprocessing directive `#include'.
```src/main.c
#include "header.h"
int main (void)
{
...
}
```
Including a header file produces the same results as copying the header file
into each source file that needs it. Such copying would be time-consuming
and error-prone. With a header file, the related declarations appear
in only one place. If they need to be changed, they can be changed in one
place, and programs that include the header file will automatically use the
new version when next recompiled. The header file eliminates the labor of
finding and changing all the copies as well as the risk that a failure to
find one copy will result in inconsistencies within a program.
In C, the usual convention is to give header files names that end with `.h'.
It is most portable to use only letters, digits, dashes, and underscores in
header file names, and at most one dot.
Read more about using header files in official GCC documentation:
* Include Syntax
* Include Operation
* Once-Only Headers
* Computed Includes
https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

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This directory is intended for project specific (private) libraries.
PlatformIO will compile them to static libraries and link into executable file.
The source code of each library should be placed in a an own separate directory
("lib/your_library_name/[here are source files]").
For example, see a structure of the following two libraries `Foo` and `Bar`:
|--lib
| |
| |--Bar
| | |--docs
| | |--examples
| | |--src
| | |- Bar.c
| | |- Bar.h
| | |- library.json (optional, custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
| |
| |--Foo
| | |- Foo.c
| | |- Foo.h
| |
| |- README --> THIS FILE
|
|- platformio.ini
|--src
|- main.c
and a contents of `src/main.c`:
```
#include <Foo.h>
#include <Bar.h>
int main (void)
{
...
}
```
PlatformIO Library Dependency Finder will find automatically dependent
libraries scanning project source files.
More information about PlatformIO Library Dependency Finder
- https://docs.platformio.org/page/librarymanager/ldf.html

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; PlatformIO Project Configuration File
;
; Build options: build flags, source filter
; Upload options: custom upload port, speed and extra flags
; Library options: dependencies, extra library storages
; Advanced options: extra scripting
;
; Please visit documentation for the other options and examples
; https://docs.platformio.org/page/projectconf.html
[env:odroid_esp32]
platform = espressif32
board = odroid_esp32
framework = arduino
lib_deps =
ESP32 BLE Arduino

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/*
Video: https://www.youtube.com/watch?v=oCMOYS71NIU
Based on Neil Kolban example for IDF: https://github.com/nkolban/esp32-snippets/blob/master/cpp_utils/tests/BLE%20Tests/SampleNotify.cpp
Ported to Arduino ESP32 by Evandro Copercini
Create a BLE server that, once we receive a connection, will send periodic notifications.
The service advertises itself as: 6E400001-B5A3-F393-E0A9-E50E24DCCA9E
Has a characteristic of: 6E400002-B5A3-F393-E0A9-E50E24DCCA9E - used for receiving data with "WRITE"
Has a characteristic of: 6E400003-B5A3-F393-E0A9-E50E24DCCA9E - used to send data with "NOTIFY"
The design of creating the BLE server is:
1. Create a BLE Server
2. Create a BLE Service
3. Create a BLE Characteristic on the Service
4. Create a BLE Descriptor on the characteristic
5. Start the service.
6. Start advertising.
In this example rxValue is the data received (only accessible inside that function).
And txValue is the data to be sent, in this example just a byte incremented every second.
*/
#include <Arduino.h>
#include <BLEDevice.h>
#include <BLEServer.h>
#include <BLEUtils.h>
#include <BLE2902.h>
BLEServer *pServer = NULL;
BLECharacteristic * pRTxCharacteristic;
bool deviceConnected = false;
bool oldDeviceConnected = false;
uint8_t txValue = 0;
// See the following for generating UUIDs:
// https://www.uuidgenerator.net/
#define SERVICE_UUID "0000ffe0-0000-1000-8000-00805f9b34fb" // UART service UUID
#define CHARACTERISTIC_UUID_RTX "0000ffe1-0000-1000-8000-00805f9b34fb"
#define BUTTON_A_PIN 32
#define BUTTON_B_PIN 33
uint8_t params[] = { 0x66, 0x11, 0x20, 0x00, 0x64, 0x30, 0x3C, 0x2A, 0x14, 0xD9, 0x00, 0x32, 0x00, 0x64, 0x00, 0x2D, 0x00, 0xCC, 0x10, 0x64, 0x32, 0xFC, 0x53, 0x98, 0x08, 0x64, 0x00, 0x41, 0x00, 0x00, 0x00, 0x28, 0x00, 0x00, 0x00, 0x78 };
byte params_request[] = {0x66, 0x11, 0x00, 0x77};
bool send_params = false;
uint8_t status[] = { 0x66, 0x41, 0x05, 0x32, 0x32, 0x00, 0x00, 0x02 , 0x02};
byte status_request[] = {0x66, 0x41, 0x02};
bool send_status = false;
void write_status_checksum() {
int suma = 0;
for (int i = 0; i < sizeof(status) - 1; i++) {
suma += status[i];
}
int tmp_suma = (suma / 256) * 256;
status[8] = suma - tmp_suma;
status[8] = 0;
}
class MyServerCallbacks: public BLEServerCallbacks {
void onConnect(BLEServer* pServer) {
deviceConnected = true;
};
void onDisconnect(BLEServer* pServer) {
deviceConnected = false;
}
};
class MyCallbacks: public BLECharacteristicCallbacks {
void onWrite(BLECharacteristic *pCharacteristic) {
std::string rxValue = pCharacteristic->getValue();
if (rxValue.length() > 0) {
if( (rxValue.length() == sizeof(params_request)) && (rxValue[0] == params_request[0]) && (rxValue[1] == params_request[1]) && (rxValue[2] == params_request[2]) && (rxValue[3] == params_request[3]) ) {
send_params = true;
}
else if( (rxValue.length() == (sizeof(status_request) + 3)) && (rxValue[0] == status_request[0]) && (rxValue[1] == status_request[1]) && (rxValue[2] == status_request[2]) ) {
send_status = true;
}
Serial.print(rxValue.length());
Serial.print(" ");
Serial.print(sizeof(status_request));
Serial.print(" ");
Serial.print(sizeof(status));
Serial.println();
Serial.print("Received Value: ");
for (int i = 0; i < rxValue.length(); i++) {
Serial.print(rxValue[i], HEX);
Serial.print(" ");
}
Serial.println();
Serial.println("*********");
}
}
};
void setup() {
Serial.begin(9600);
pinMode(BUTTON_A_PIN, INPUT_PULLUP);
pinMode(BUTTON_B_PIN, INPUT_PULLUP);
// Create the BLE Device
BLEDevice::init("RAYVOLT DUMMY");
// Create the BLE Server
pServer = BLEDevice::createServer();
pServer->setCallbacks(new MyServerCallbacks());
// Create the BLE Service
BLEService *pService = pServer->createService(SERVICE_UUID);
// Create a BLE Characteristic
pRTxCharacteristic = pService->createCharacteristic(
CHARACTERISTIC_UUID_RTX,
BLECharacteristic::PROPERTY_NOTIFY | BLECharacteristic::PROPERTY_WRITE
);
pRTxCharacteristic->addDescriptor(new BLE2902());
pRTxCharacteristic->setCallbacks(new MyCallbacks());
/*
BLECharacteristic * pRxCharacteristic = pService->createCharacteristic(
CHARACTERISTIC_UUID_RX,
BLECharacteristic::PROPERTY_WRITE
);
pRxCharacteristic->setCallbacks(new MyCallbacks());
*/
// Start the service
pService->start();
// Start advertising
pServer->getAdvertising()->start();
Serial.println("Waiting a client connection to notify...");
}
void loop() {
if (!digitalRead(BUTTON_A_PIN)) {
Serial.println("Button A");
if (status[3] == 0xFF) {
status[3] = 0x00;
}
else {
status[3] += 1;
}
}
if (!digitalRead(BUTTON_B_PIN)) {
Serial.println("Button B");
if (status[3] == 0x00) {
status[3] = 0xFF;
}
else {
status[3] -= 1;
}
}
if (deviceConnected) {
if (send_params) {
Serial.print("sending: ");
for (int i = 0; i < sizeof(params); i++) {
Serial.print(params[i], HEX);
pRTxCharacteristic->setValue(&params[i], 1);
pRTxCharacteristic->notify();
}
send_params = false;
Serial.println("");
}
else if (send_status) {
write_status_checksum();
Serial.print("sending: ");
for (int i = 0; i < sizeof(status); i++) {
Serial.print(status[i], HEX);
Serial.print(" ");
pRTxCharacteristic->setValue(&status[i], 1);
pRTxCharacteristic->notify();
}
send_status = false;
Serial.println("");
}
/*
pTxCharacteristic->setValue(&txValue, 1);
pTxCharacteristic->notify();
txValue++;
*/
delay(10); // bluetooth stack will go into congestion, if too many packets are sent
}
// disconnecting
if (!deviceConnected && oldDeviceConnected) {
delay(500); // give the bluetooth stack the chance to get things ready
pServer->startAdvertising(); // restart advertising
Serial.println("start advertising");
oldDeviceConnected = deviceConnected;
}
// connecting
if (deviceConnected && !oldDeviceConnected) {
// do stuff here on connecting
oldDeviceConnected = deviceConnected;
}
}

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This directory is intended for PIO Unit Testing and project tests.
Unit Testing is a software testing method by which individual units of
source code, sets of one or more MCU program modules together with associated
control data, usage procedures, and operating procedures, are tested to
determine whether they are fit for use. Unit testing finds problems early
in the development cycle.
More information about PIO Unit Testing:
- https://docs.platformio.org/page/plus/unit-testing.html