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220 lines
8.0 KiB
C++
220 lines
8.0 KiB
C++
/**
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* A BLE client example that is rich in capabilities.
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* There is a lot new capabilities implemented.
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* author unknown
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* updated by chegewara
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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("4fafc201-1fb5-459e-8fcc-c5c9c331914b");
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// The characteristic of the remote service we are interested in.
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//static BLEUUID charUUID("beb5483e-36e1-4688-b7f5-ea07361b26a8");
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static BLEUUID serviceUUID("6e400001-b5a3-f393-e0a9-e50e24dcca9e");
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static BLEUUID charReadUUID("6e400003-b5a3-f393-e0a9-e50e24dcca9e");
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static BLEUUID charWriteUUID("6e400002-b5a3-f393-e0a9-e50e24dcca9e");
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static boolean doConnect = false;
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static boolean connected = false;
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static boolean doScan = false;
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static BLERemoteCharacteristic* pRemoteCharacteristicRead;
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static BLERemoteCharacteristic* pRemoteCharacteristicWrite;
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static BLEAdvertisedDevice* myDevice;
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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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Serial.print("data: ");
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Serial.write(pData, length);
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Serial.println();
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}
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class MyClientCallback : public BLEClientCallbacks {
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void onConnect(BLEClient* pclient) {
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}
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void onDisconnect(BLEClient* pclient) {
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connected = false;
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Serial.println("onDisconnect");
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}
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};
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bool connectToServer() {
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Serial.print("Forming a connection to ");
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Serial.println(myDevice->getAddress().toString().c_str());
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BLEClient* pClient = BLEDevice::createClient();
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Serial.println(" - Created client");
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pClient->setClientCallbacks(new MyClientCallback());
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// Connect to the remove BLE Server.
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pClient->connect(myDevice); // if you pass BLEAdvertisedDevice instead of address, it will be recognized type of peer device address (public or private)
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Serial.println(" - Connected to server");
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pClient->setMTU(517); //set client to request maximum MTU from server (default is 23 otherwise)
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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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pClient->disconnect();
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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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pRemoteCharacteristicRead = pRemoteService->getCharacteristic(charReadUUID);
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if (pRemoteCharacteristicRead == nullptr) {
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Serial.print("Failed to find our characteristic UUID: ");
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Serial.println(charReadUUID.toString().c_str());
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pClient->disconnect();
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return false;
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}
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Serial.println(" - Found our characteristic");
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// Obtain a reference to the characteristic in the service of the remote BLE server.
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pRemoteCharacteristicWrite = pRemoteService->getCharacteristic(charWriteUUID);
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if (pRemoteCharacteristicWrite == nullptr) {
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Serial.print("Failed to find our characteristic UUID: ");
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Serial.println(charWriteUUID.toString().c_str());
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pClient->disconnect();
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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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if(pRemoteCharacteristicRead->canRead()) {
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//std::string value = pRemoteCharacteristicRead->readValue();
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String value = pRemoteCharacteristicRead->readValue();
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Serial.print("The characteristic value was: ");
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Serial.println(value.c_str());
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}
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if(pRemoteCharacteristicRead->canNotify())
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pRemoteCharacteristicRead->registerForNotify(notifyCallback);
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connected = true;
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return true;
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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.isAdvertisingService(serviceUUID)) {
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BLEDevice::getScan()->stop();
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myDevice = new BLEAdvertisedDevice(advertisedDevice);
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doConnect = true;
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doScan = true;
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} // Found our server
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} // onResult
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}; // MyAdvertisedDeviceCallbacks
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// 使用工具函数发送16进制数据
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void sendHexDataBle(String hexString) {
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uint8_t data[hexString.length()/2];
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// 将16进制字符串转换为字节数组
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for(int i = 0; i < hexString.length(); i += 2) {
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String byteString = hexString.substring(i, i+2);
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data[i/2] = (uint8_t)strtol(byteString.c_str(), NULL, 16);
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}
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pRemoteCharacteristicWrite->writeValue(data, sizeof(data));
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Serial.println("Setting new characteristic value to \"" + hexString + "\"");
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}
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// 使用工具函数发送字符串数据
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void sendStringDataBle(String 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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pRemoteCharacteristicWrite->writeValue(newValue.c_str(), newValue.length());
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Serial.println("Setting new characteristic value to \"" + newValue + "\"");
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}
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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 5 seconds.
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BLEScan* pBLEScan = BLEDevice::getScan();
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pBLEScan->setAdvertisedDeviceCallbacks(new MyAdvertisedDeviceCallbacks());
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pBLEScan->setInterval(1349);
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pBLEScan->setWindow(449);
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pBLEScan->setActiveScan(true);
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pBLEScan->start(5, false);
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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()) {
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Serial.println("We are now connected to the BLE Server.");
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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 = "VR";//读固件版本号 false
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String newValue = "BV ";//电量 false
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// String newValue = "0B0B6300";//温度测量 //无响应数据 true
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// String newValue = "4854";//温湿度测量 //无响应数据 true
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// String newValue = "1F13";//位移测量 //无响应数据 true
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// String newValue = "Time since boot: ";//
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// String newValue = "Time since boot: ";//
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// String newValue = "Time since boot: " + String(millis()/1000);//
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// 方法2: 使用字符串转换
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String hexString = "0B0B6300";//温度测量
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// String hexString = "4854";//温湿度测量
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// String hexString = "1F13";//位移测量
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uint8_t data[hexString.length()/2];
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// 将16进制字符串转换为字节数组
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for(int i = 0; i < hexString.length(); i += 2) {
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String byteString = hexString.substring(i, i+2);
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data[i/2] = (uint8_t)strtol(byteString.c_str(), NULL, 16);
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}
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//pRemoteCharacteristicWrite->writeValue(data, sizeof(data));
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sendHexDataBle(hexString);
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delay(2000);
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sendStringDataBle(newValue);
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}else if(doScan){
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BLEDevice::getScan()->start(0); // this is just example to start scan after disconnect, most likely there is better way to do it in arduino
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}
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delay(10000); // Delay a second between loops.
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} // End of loop
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