135 lines
4.7 KiB
Arduino
135 lines
4.7 KiB
Arduino
/**
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* A BLE client example that is rich in capabilities.
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*/
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#include "BLEDevice.h"
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//#include "BLEScan.h"
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// The remote service we wish to connect to.
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static BLEUUID serviceUUID("91bad492-b950-4226-aa2b-4ede9fa42f59");
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// The characteristic of the remote service we are interested in.
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static BLEUUID charUUID("0d563a58-196a-48ce-ace2-dfec78acc814");
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static BLEAddress *pServerAddress;
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static boolean doConnect = false;
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static boolean connected = false;
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static BLERemoteCharacteristic* pRemoteCharacteristic;
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static void notifyCallback(
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BLERemoteCharacteristic* pBLERemoteCharacteristic,
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uint8_t* pData,
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size_t length,
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bool isNotify) {
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Serial.print("Notify callback for characteristic ");
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Serial.print(pBLERemoteCharacteristic->getUUID().toString().c_str());
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Serial.print(" of data length ");
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Serial.println(length);
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}
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bool connectToServer(BLEAddress pAddress) {
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Serial.print("Forming a connection to ");
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Serial.println(pAddress.toString().c_str());
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BLEClient* pClient = BLEDevice::createClient();
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Serial.println(" - Created client");
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// Connect to the remove BLE Server.
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pClient->connect(pAddress);
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Serial.println(" - Connected to server");
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// Obtain a reference to the service we are after in the remote BLE server.
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BLERemoteService* pRemoteService = pClient->getService(serviceUUID);
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if (pRemoteService == nullptr) {
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Serial.print("Failed to find our service UUID: ");
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Serial.println(serviceUUID.toString().c_str());
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return false;
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}
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Serial.println(" - Found our service");
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// Obtain a reference to the characteristic in the service of the remote BLE server.
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pRemoteCharacteristic = pRemoteService->getCharacteristic(charUUID);
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if (pRemoteCharacteristic == nullptr) {
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Serial.print("Failed to find our characteristic UUID: ");
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Serial.println(charUUID.toString().c_str());
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return false;
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}
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Serial.println(" - Found our characteristic");
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// Read the value of the characteristic.
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std::string value = pRemoteCharacteristic->readValue();
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Serial.print("The characteristic value was: ");
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Serial.println(value.c_str());
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pRemoteCharacteristic->registerForNotify(notifyCallback);
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}
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/**
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* Scan for BLE servers and find the first one that advertises the service we are looking for.
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*/
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class MyAdvertisedDeviceCallbacks: public BLEAdvertisedDeviceCallbacks {
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/**
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* Called for each advertising BLE server.
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*/
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void onResult(BLEAdvertisedDevice advertisedDevice) {
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Serial.print("BLE Advertised Device found: ");
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Serial.println(advertisedDevice.toString().c_str());
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// We have found a device, let us now see if it contains the service we are looking for.
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if (advertisedDevice.haveServiceUUID() && advertisedDevice.getServiceUUID().equals(serviceUUID)) {
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//
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Serial.print("Found our device! address: ");
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advertisedDevice.getScan()->stop();
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pServerAddress = new BLEAddress(advertisedDevice.getAddress());
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doConnect = true;
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} // Found our server
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} // onResult
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}; // MyAdvertisedDeviceCallbacks
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void setup() {
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Serial.begin(115200);
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Serial.println("Starting Arduino BLE Client application...");
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BLEDevice::init("");
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// Retrieve a Scanner and set the callback we want to use to be informed when we
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// have detected a new device. Specify that we want active scanning and start the
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// scan to run for 30 seconds.
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BLEScan* pBLEScan = BLEDevice::getScan();
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pBLEScan->setAdvertisedDeviceCallbacks(new MyAdvertisedDeviceCallbacks());
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pBLEScan->setActiveScan(true);
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pBLEScan->start(30);
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} // End of setup.
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// This is the Arduino main loop function.
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void loop() {
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// If the flag "doConnect" is true then we have scanned for and found the desired
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// BLE Server with which we wish to connect. Now we connect to it. Once we are
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// connected we set the connected flag to be true.
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if (doConnect == true) {
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if (connectToServer(*pServerAddress)) {
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Serial.println("We are now connected to the BLE Server.");
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connected = true;
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} else {
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Serial.println("We have failed to connect to the server; there is nothin more we will do.");
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}
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doConnect = false;
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}
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// If we are connected to a peer BLE Server, update the characteristic each time we are reached
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// with the current time since boot.
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if (connected) {
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String newValue = "Time since boot: " + String(millis()/1000);
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Serial.println("Setting new characteristic value to \"" + newValue + "\"");
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// Set the characteristic's value to be the array of bytes that is actually a string.
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pRemoteCharacteristic->writeValue(newValue.c_str(), newValue.length());
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}
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delay(1000); // Delay a second between loops.
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} // End of loop
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