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Fix stalling after connecting to BLE Server #2

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Fix stalling after connecting to BLE Server #2

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20 changes: 14 additions & 6 deletions src/ESP32_BLE_client_uart.ino
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Original file line number Diff line number Diff line change
Expand Up @@ -67,11 +67,12 @@ static BLEUUID charUUID_RX("6E400002-B5A3-F393-E0A9-E50E24DCCA9E"); // RX Char
// the server can send data to the client as notifications.
static BLEUUID charUUID_TX("6E400003-B5A3-F393-E0A9-E50E24DCCA9E"); // TX Characteristic

static BLEAddress *pServerAddress;
static boolean doConnect = false;
static boolean connected = false;
static BLERemoteCharacteristic* pTXCharacteristic;
static BLERemoteCharacteristic* pRXCharacteristic;
static BLEAdvertisedDevice *myDevice;


static void notifyCallback(
BLERemoteCharacteristic* pBLERemoteCharacteristic,
Expand All @@ -87,15 +88,15 @@ static void notifyCallback(
Serial.println();
}

bool connectToServer(BLEAddress pAddress) {
bool connectToServer() {
Serial.print("Establishing a connection to device address: ");
Serial.println(pAddress.toString().c_str());
Serial.println(myDevice->getAddress().toString().c_str());

BLEClient* pClient = BLEDevice::createClient();
Serial.println(" - Created client");

// Connect to the remove BLE Server.
pClient->connect(pAddress);
pClient->connect(myDevice);
Serial.println(" - Connected to server");

// Obtain a reference to the Nordic UART service on the remote BLE server.
Expand Down Expand Up @@ -136,6 +137,9 @@ bool connectToServer(BLEAddress pAddress) {
// Write to the the RX characteristic.
String helloValue = "Hello Remote Server";
pRXCharacteristic->writeValue(helloValue.c_str(), helloValue.length());

//Mandatory to avoid crash on check of function return
return true;
}


Expand All @@ -154,9 +158,13 @@ class MyAdvertisedDeviceCallbacks: public BLEAdvertisedDeviceCallbacks {
if (advertisedDevice.haveServiceUUID() && advertisedDevice.getServiceUUID().equals(serviceUUID)) {

Serial.println("Found a device with the desired ServiceUUID!");

// Is this really needed ? https://github.com/espressif/arduino-esp32/blob/master/libraries/BLE/examples/Client/Client.ino says
// BLEDevice::getScan()->stop();
advertisedDevice.getScan()->stop();

pServerAddress = new BLEAddress(advertisedDevice.getAddress());
myDevice = new BLEAdvertisedDevice(advertisedDevice);

doConnect = true;

} // Found our server
Expand Down Expand Up @@ -190,7 +198,7 @@ void loop() {
// BLE Server with which we wish to connect. Now we connect to it. Once we are
// connected we set the connected flag to be true.
if (doConnect == true) {
if (connectToServer(*pServerAddress)) {
if (connectToServer()) {
Serial.println("We are now connected to the BLE Server.");
connected = true;
} else {
Expand Down