esp32 client for T-keyboard
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allthemod
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6367192e4d
commit
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const char keys[] = {
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0x0, 0x0, 0x0, 0x0,
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'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i',
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'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r',
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's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
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'1', '2', '3', '4', '5', '6', '7', '8', '9', '0',
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'\n', 0x0, 0x0, // DEL
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0x0, // TAB
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' ', // SPACE
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'-', '=', '[', ']', '\\', 0x0, ';', '\'', '`', ',', '.', '/',
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0x0, // CAPS LOCK
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x4f, // R_ARROW
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0x0, // L_ARROW
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0x0, // D_ARROW
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0x0, // U_ARROW
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0x0, // NUM LOCK
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};
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const char shift_keys[] = {
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0x0, 0x0, 0x0, 0x0,
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'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I',
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'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R',
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'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
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'!', '@', '#', '$', '%', '^', '&', '*', '(', ')',
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'\n', 0x0, 0x0, // DEL
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0x0, // TAB
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' ', // SPACE
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'_', '+', '{', '}', '|', 0x0, ':', '"', '~', '<', '>', '?',
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0x0, // CAPS LOCK
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
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0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x4f, // R_ARROW
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0x0, // L_ARROW
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0x0, // D_ARROW
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0x0, // U_ARROW
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0x0, // NUM LOCK
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};
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/**
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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 <Arduino.h>
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#include "BLEDevice.h"
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// The remote service we wish to connect to.
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static BLEUUID serviceUUID((uint16_t) 0x1812);
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// The characteristic of the remote service we are interested in.
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static BLEUUID charUUID((uint16_t) 0x2a4d);
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static bool doConnect = false;
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static bool connected = false;
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static bool doScan = false;
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static BLERemoteCharacteristic* pRemoteCharacteristic;
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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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#ifdef DEBUG
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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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for (size_t i = 0; i < length; i++)
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{
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Serial.printf("%2x", pData[i]);
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}
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Serial.println("");
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#endif
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if(pData[0] == 0x0 && pData[2] != 0x0) {
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Serial.printf("%c", keys[pData[2]]);
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} else if(pData[0] == 0x02 && pData[2] != 0x0) {
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Serial.printf("%c", shift_keys[pData[2]]);
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}
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}
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class MyClientCallback : public BLEClientCallbacks {
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void onConnect(BLEClient* pclient) {
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connected = true;
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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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if(!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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return false;
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}
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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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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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do {
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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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pClient->disconnect();
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return false;
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}
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if(pRemoteCharacteristic->canNotify())
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break;
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} while(1);
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Serial.println(" - Found our characteristic");
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pRemoteCharacteristic->registerForNotify(notifyCallback);
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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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public:
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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 (strstr(advertisedDevice.getName().c_str(), "T-Keyboard") != NULL) {
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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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// void Start() {
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// Serial.println("Starting Arduino BLE Client application...");
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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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// // do nothing, all data is handled in notifications callback
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// }else if(doScan){
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// BLEDevice::getScan()->start(0); // this is just eample 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(1000); // Delay a second between loops.
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// } // End of loop
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@ -0,0 +1,5 @@
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This is code for connecting to the T-keyboard through an esp32.
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All you need to do is put the include in your librries folder and use the main.cpp as your project code.
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It finds a ble device with the name of the T-keybaord connects to it and reads his input to the notify function in the TKeyboardClient.h.
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you should modify that function for your needs.
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creadit for [allthemod](https://github.com/allthemod) and for [chegewara](https://github.com/chegewara)
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@ -0,0 +1,35 @@
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#include <BLEDevice.h>
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#include <stdio.h>
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#include <string.h>
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#include <Arduino.h>
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#include "TKeyboardClient.h"
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BLEClient* pClient = nullptr;
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void setup() {
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Serial.begin(115200);
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Serial.println("Starting...");
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MyAdvertisedDeviceCallbacks callbackDev = MyAdvertisedDeviceCallbacks();
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BLEDevice::init("T-Keyboard client");
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BLEScan* pBLEScan = BLEDevice::getScan();
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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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BLEScanResults res =pBLEScan->start(5, false);
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int count = res.getCount();
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Serial.printf("count %1d \n", count);
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for(int i=0; i < count; i++){
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Serial.print(i);
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Serial.println(" checking...");
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callbackDev.onResult(res.getDevice(i));
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}
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if(connectToServer()){
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Serial.println("We are now connected to the BLE Server.");
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}
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delay(5000);
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}
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void loop() {
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}
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