Hello,
I would like to program the Wio Terminal so that it sends by bluetooth low energy a bool value that is changed with the button. I have tried by modifying the example BLE_server from the Arduino rpcBLE library. The problem is that I need the line pCharacteristic->setValue inside the void loop instead of the void setup. But then pCharacteristic and thus pServer and pService have to be declared in the header. I have tried the following program but it makes the Wio Terminal disappearing from the available ports when compiling and I have to reset it.
/*
Based on Neil Kolban example for IDF: https://github.com/nkolban/esp32-snippets/blob/master/cpp_utils/tests/BLE%20Tests/SampleServer.cpp
Ported to Arduino ESP32 by Evandro Copercini
updates by chegewara
*/
#include <rpcBLEDevice.h>
#include <BLEServer.h>
// See the following for generating UUIDs:
// https://www.uuidgenerator.net/
#define SERVICE_UUID "180f"
#define CHARACTERISTIC_UUID "2a19"
#define DESCRIPTOR_UUID "4545"
bool button_save = false; // a bool that becomes true when button B is pressed
// and false when button C is pressed
int i=0; // the integer that is send by BLE for button_save
BLEServer *pServer = BLEDevice::createServer();
BLEService *pService = pServer->createService(SERVICE_UUID);
BLECharacteristic *pCharacteristic = pService->createCharacteristic(
CHARACTERISTIC_UUID,
BLECharacteristic::PROPERTY_READ |
BLECharacteristic::PROPERTY_WRITE
);
//class MyCallbacks: public BLECharacteristicCallbacks {
// void onWrite(BLECharacteristic *pCharacteristic) {
// std::string rxValue = pCharacteristic->getValue();
//
// if (rxValue.length() > 0) {
// Serial.println("*********");
// Serial.print("Received Value: ");
// for (int i = 0; i < rxValue.length(); i++)
// Serial.print(rxValue[i]);
//
// Serial.println();
// Serial.println("*********");
// }
// }
//};
void setup() {
Serial.begin(115200);
pinMode(WIO_KEY_A, INPUT_PULLUP);
pinMode(WIO_KEY_B, INPUT_PULLUP);
pinMode(WIO_KEY_C, INPUT_PULLUP);
while(!Serial){};
Serial.println("Starting BLE work!");
BLEDevice::init("Long name works now");
pCharacteristic->setAccessPermissions(GATT_PERM_READ | GATT_PERM_WRITE);
// BLEDescriptor *pDescriptor = pCharacteristic->createDescriptor(
// DESCRIPTOR_UUID,
// ATTRIB_FLAG_VOID | ATTRIB_FLAG_ASCII_Z,
// GATT_PERM_READ | GATT_PERM_WRITE,
// 2
// );
//pCharacteristic->setValue("Hello World says Neil");
pCharacteristic->setValue(i);
//pCharacteristic->setCallbacks(new MyCallbacks());
pService->start();
// BLEAdvertising *pAdvertising = pServer->getAdvertising(); // this still is working for backward compatibility
BLEAdvertising *pAdvertising = BLEDevice::getAdvertising();
pAdvertising->addServiceUUID(SERVICE_UUID);
pAdvertising->setScanResponse(true);
pAdvertising->setMinPreferred(0x06); // functions that help with iPhone connections issue
pAdvertising->setMinPreferred(0x12);
BLEDevice::startAdvertising();
Serial.println("Characteristic defined! Now you can read it in your phone!");
}
void loop() {
if (digitalRead(WIO_KEY_B) == LOW) {
if (button_save == false){
button_save = true;
Serial.println("true");
}
}
if (digitalRead(WIO_KEY_A) == LOW) {
if (button_save == true){
button_save = false;
Serial.println("false");
}
i=(int)button_save;
pCharacteristic->setValue(i);
//pCharacteristic->setCallbacks(new MyCallbacks());
pService->start();
}
}
Does anyone could help me?