BLE CLIENT
<pre><code>/**
* A BLE client example that is rich in capabilities.
* There is a lot new capabilities implemented.
* author unknown
* updated by chegewara
*/
#include "BLEDevice.h"
//#include "BLEScan.h"
// The remote service we wish to connect to.
static BLEUUID serviceUUID("69400001-b5a3-f393-e0a9-e50e24dcca99");
// The characteristic of the remote service we are interested in.
static BLEUUID writecharUUID("69400002-b5a3-f393-e0a9-e50e24dcca99"); // write no response
static BLEUUID charUUID("69400003-b5a3-f393-e0a9-e50e24dcca99"); // notify
//const std::string BLEName("XT-DE8BF9ABFD5A");
//const std::string BLEName("12345678");
const std::string BLEName("12345681");
//const std::string BLEName("12345679");
//const std::string BLEName("XT-EFC965DED19A");
//const std::string BLEName("XT-E85F8A5F8BB9");
std::string BLENameSet;
static boolean doConnect = false;
static boolean connected = false;
static boolean doScan = false;
static BLERemoteCharacteristic* pRemoteCharacteristic, *pRemoteWriteCharacteristic;
static BLEAdvertisedDevice* myDevice;
static void notifyCallback(
BLERemoteCharacteristic* pBLERemoteCharacteristic,
uint8_t* pData,
size_t length,
bool isNotify) {
/* Serial.print("Notify callback for characteristic ");
Serial.print(pBLERemoteCharacteristic->getUUID().toString().c_str());
Serial.print(" of data length ");
Serial.println(length);
Serial.print("data: ");*/
if (pBLERemoteCharacteristic == pRemoteCharacteristic)
{
pData[length] = 0;
Serial.print((char*)pData);
}
}
class MyClientCallback : public BLEClientCallbacks {
void onConnect(BLEClient* pclient) {
}
void onDisconnect(BLEClient* pclient) {
connected = false;
doConnect = true;
Serial.println("onDisconnect");
}
};
bool connectToServer() {
Serial.print("Forming a connection to ");
Serial.println(myDevice->getAddress().toString().c_str());
BLEClient* pClient = BLEDevice::createClient();
Serial.println(" - Created client");
pClient->setClientCallbacks(new MyClientCallback());
// Connect to the remove BLE Server.
pClient->connect(myDevice); // if you pass BLEAdvertisedDevice instead of address, it will be recognized type of peer device address (public or private)
Serial.println(" - Connected to server");
// Obtain a reference to the service we are after in the remote BLE server.
BLERemoteService* pRemoteService = pClient->getService(serviceUUID);
if (pRemoteService == nullptr) {
Serial.print("Failed to find our service UUID: ");
Serial.println(serviceUUID.toString().c_str());
pClient->disconnect();
return false;
}
Serial.println(" - Found our service");
// Obtain a reference to the characteristic in the service of the remote BLE server.
pRemoteCharacteristic = pRemoteService->getCharacteristic(charUUID);
if (pRemoteCharacteristic == nullptr) {
Serial.print("Failed to find our characteristic UUID: ");
Serial.println(charUUID.toString().c_str());
pClient->disconnect();
return false;
}
Serial.println(" - Found our characteristic");
// Read the value of the characteristic.
if(pRemoteCharacteristic->canRead()) {
std::string value = pRemoteCharacteristic->readValue();
Serial.print("The characteristic value was: ");
Serial.println(value.c_str());
}
if(pRemoteCharacteristic->canNotify())
Serial.println("The characteristic can notify");
pRemoteCharacteristic->registerForNotify(notifyCallback);
// Obtain a reference to the characteristic in the service of the remote BLE server.
pRemoteWriteCharacteristic = pRemoteService->getCharacteristic(writecharUUID);
if (pRemoteWriteCharacteristic == nullptr) {
Serial.print("Failed to find our characteristic UUID: ");
Serial.println(writecharUUID.toString().c_str());
pClient->disconnect();
return false;
}
Serial.println(" - Found our characteristic");
if(pRemoteWriteCharacteristic->canWriteNoResponse())
Serial.println("The characteristic can write no response");
connected = true;
}
/**
* Scan for BLE servers and find the first one that advertises the service we are looking for.
*/
class MyAdvertisedDeviceCallbacks: public BLEAdvertisedDeviceCallbacks {
/**
* Called for each advertising BLE server.
*/
void onResult(BLEAdvertisedDevice advertisedDevice) {
Serial.print("BLE Advertised Device found: ");
Serial.println(advertisedDevice.toString().c_str());
// We have found a device, let us now see if it contains the service we are looking for.
if ((advertisedDevice.getName() == BLENameSet) && advertisedDevice.haveServiceUUID() && advertisedDevice.isAdvertisingService(serviceUUID)) {
BLEDevice::getScan()->stop();
myDevice = new BLEAdvertisedDevice(advertisedDevice);
doConnect = true;
doScan = true;
} // Found our server
} // onResult
}; // MyAdvertisedDeviceCallbacks
void setup() {
Serial.begin(115200);
Serial.println("Starting Arduino BLE Client application...");
Serial.println("Please select ble device first...");
while(1)
{
String setname = Serial.readStringUntil('\n');
if(setname.length())
{
BLENameSet = setname.c_str();
break;
}
}
Serial.println(String("ble name:") + BLENameSet.c_str());
BLEDevice::init("");
// Retrieve a Scanner and set the callback we want to use to be informed when we
// have detected a new device. Specify that we want active scanning and start the
// scan to run for 5 seconds.
BLEScan* pBLEScan = BLEDevice::getScan();
pBLEScan->setAdvertisedDeviceCallbacks(new MyAdvertisedDeviceCallbacks());
pBLEScan->setInterval(1349);
pBLEScan->setWindow(449);
pBLEScan->setActiveScan(true);
pBLEScan->start(5, false);
} // End of setup.
byte serial_recv_buf[512];
int serial_recv_len = 0;
// This is the Arduino main loop function.
void loop() {
serial_recv_len = 0;
while (Serial.available() > 0) {
serial_recv_buf[serial_recv_len++] = Serial.read();
}
// If the flag "doConnect" is true then we have scanned for and found the desired
// 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()) {
Serial.println("We are now connected to the BLE Server.");
} else {
Serial.println("We have failed to connect to the server; there is nothin more we will do.");
}
doConnect = false;
}
// If we are connected to a peer BLE Server, update the characteristic each time we are reached
// with the current time since boot.
if (connected) {
if(serial_recv_len > 0){
pRemoteWriteCharacteristic->writeValue(serial_recv_buf, serial_recv_len);
}
}/*else if(doScan){
BLEDevice::getScan()->start(0); // this is just eample to start scan after disconnect, most likely there is better way to do it in arduino
}*/
delay(10);
} // End of loop</code></pre>