Arduino_ESP32_BLE_Keyboard_Consumer_Control.ino

#include <BLEDevice.h>
#include <BLEUtils.h>
#include <BLEServer.h>
#include "BLE2902.h"
#include "BLEHIDDevice.h"
#include "HIDTypes.h"
#include "HIDKeyboardTypes.h"

// See the following for generating UUIDs:
// https://www.uuidgenerator.net/

const uint8_t keyboardHidDescriptor[] = {
  0x05, 0x0c,                    // USAGE_PAGE (Consumer Devices)
  0x09, 0x01,                    // USAGE (Consumer Control)
  0xa1, 0x01,                    // COLLECTION (Application)
  0x85, 0x01,                    //   REPORT_ID (1)
  0x19, 0x00,                    //   USAGE_MINIMUM (Unassigned)
  0x2a, 0x3c, 0x02,              //   USAGE_MAXIMUM (AC Format)
  0x15, 0x00,                    //   LOGICAL_MINIMUM (0)
  0x26, 0x3c, 0x02,              //   LOGICAL_MAXIMUM (572)
  0x95, 0x01,                    //   REPORT_COUNT (1)
  0x75, 0x10,                    //   REPORT_SIZE (16)
  0x81, 0x00,                    //   INPUT (Data,Var,Abs)
  0xc0,                          // END_COLLECTION
  0x05, 0x01,                    // USAGE_PAGE (Generic Desktop)
  0x09, 0x06,                    // USAGE (Keyboard)
  0xa1, 0x01,                    // COLLECTION (Application)
  0x85, 0x02,                    //   REPORT_ID (2)
  0x05, 0x07,                    //   USAGE_PAGE (Keyboard)
  0x19, 0xe0,                    //   USAGE_MINIMUM (Keyboard LeftControl)
  0x29, 0xe7,                    //   USAGE_MAXIMUM (Keyboard Right GUI)
  0x15, 0x00,                    //   LOGICAL_MINIMUM (0)
  0x25, 0x01,                    //   LOGICAL_MAXIMUM (1)
  0x75, 0x01,                    //   REPORT_SIZE (1)
  0x95, 0x08,                    //   REPORT_COUNT (8)
  0x81, 0x02,                    //   INPUT (Data,Var,Abs)
  0x95, 0x01,                    //   REPORT_COUNT (1)
  0x75, 0x08,                    //   REPORT_SIZE (8)
  0x25, 0x65,                    //   LOGICAL_MAXIMUM (101)
  0x19, 0x00,                    //   USAGE_MINIMUM (Reserved (no event indicated))
  0x29, 0x65,                    //   USAGE_MAXIMUM (Keyboard Application)
  0x81, 0x00,                    //   INPUT (Data,Ary,Abs)
  0xc0                           // END_COLLECTION
};


typedef struct
{
 //uint8_t  reportId;                                 // Report ID = 0x02 (2)
  // Collection: CA:ConsumerControl
  uint16_t ConsumerControl;                          // Value = 0 to 572
} inputConsumer_t;
  
static uint8_t idleRate;           /* in 4 ms units */

typedef struct
{
// uint8_t  reportId;                                 // Report ID = 0x02 (2)
  // Collection: CA:Keyboard
  uint8_t  KB_KeyboardKeyboardLeftControl  : 1;       // Usage 0x000700E0: Keyboard Left Control, Value = 0 to 1
  uint8_t  KB_KeyboardKeyboardLeftShift  : 1;         // Usage 0x000700E1: Keyboard Left Shift, Value = 0 to 1
  uint8_t  KB_KeyboardKeyboardLeftAlt    : 1;           // Usage 0x000700E2: Keyboard Left Alt, Value = 0 to 1
  uint8_t  KB_KeyboardKeyboardLeftGui    : 1;           // Usage 0x000700E3: Keyboard Left GUI, Value = 0 to 1
  uint8_t  KB_KeyboardKeyboardRightControl : 1;      // Usage 0x000700E4: Keyboard Right Control, Value = 0 to 1
  uint8_t  KB_KeyboardKeyboardRightShift   : 1;        // Usage 0x000700E5: Keyboard Right Shift, Value = 0 to 1
  uint8_t  KB_KeyboardKeyboardRightAlt   : 1;          // Usage 0x000700E6: Keyboard Right Alt, Value = 0 to 1
  uint8_t  KB_KeyboardKeyboardRightGui   : 1;          // Usage 0x000700E7: Keyboard Right GUI, Value = 0 to 1
  uint8_t  Key;                                 // Value = 0 to 101
} inputKeyboard_t;

static inputConsumer_t consumer_Report{};
static inputKeyboard_t keyboard_report{}; // sent to PC

BLEHIDDevice* hid;
BLECharacteristic* input;
BLECharacteristic* output;
BLECharacteristic* inputVolume;
BLECharacteristic* outputVolume;
bool connected = false;

class MyCallbacks : public BLEServerCallbacks {
  void onConnect(BLEServer* pServer){
    connected = true;
    BLE2902* desc = (BLE2902*)input->getDescriptorByUUID(BLEUUID((uint16_t)0x2902));
    desc->setNotifications(true);
    
    BLE2902* descv = (BLE2902*)inputVolume->getDescriptorByUUID(BLEUUID((uint16_t)0x2902));
    descv->setNotifications(true);
  }

  void onDisconnect(BLEServer* pServer){
    connected = false;
    BLE2902* desc = (BLE2902*)input->getDescriptorByUUID(BLEUUID((uint16_t)0x2902));
    desc->setNotifications(false);
    
    BLE2902* descv = (BLE2902*)inputVolume->getDescriptorByUUID(BLEUUID((uint16_t)0x2902));
    descv->setNotifications(false);
  }
};


  const int ledPin = A12;


void taskServer(void*){
  BLEDevice::init("ESP32");
  BLEServer *pServer = BLEDevice::createServer();
  pServer->setCallbacks(new MyCallbacks());

  hid = new BLEHIDDevice(pServer);
  inputVolume = hid->inputReport(1); // <-- input REPORTID from report map
  outputVolume = hid->outputReport(1); // <-- output REPORTID from report map

  
  input = hid->inputReport(2); // <-- input REPORTID from report map
  output = hid->outputReport(2); // <-- output REPORTID from report map

  std::string name = "ElectronicCats";
  hid->manufacturer()->setValue(name);

  hid->pnp(0x02, 0xe502, 0xa111, 0x0210);
  hid->hidInfo(0x00,0x02);

  hid->reportMap((uint8_t*)keyboardHidDescriptor, sizeof(keyboardHidDescriptor));
  hid->startServices();


  BLESecurity *pSecurity = new BLESecurity();
//  pSecurity->setKeySize();
  pSecurity->setAuthenticationMode(ESP_LE_AUTH_BOND);


  BLEAdvertising *pAdvertising = pServer->getAdvertising();
  pAdvertising->setAppearance(HID_KEYBOARD);
  pAdvertising->addServiceUUID(hid->hidService()->getUUID());
  pAdvertising->start();
  hid->setBatteryLevel(7);

  delay(portMAX_DELAY);
}

  
void setup() {
  Serial.begin(115200);
  Serial.println("Starting BLE work!");
  
  pinMode(ledPin, OUTPUT);

//  keyboard_report.reportId = 0x02;
  //consumer_Report.reportId = 0x01;

  xTaskCreate(taskServer, "server", 20000, NULL, 5, NULL);
}


void loop() {
  static bool volDirUp = true;
  // put your main code here, to run repeatedly:
  delay(4000);
  if(connected){
    digitalWrite(ledPin, HIGH);
    inputKeyboard_t a{};
    a.Key = random(0x02,0x27);
 //   a.reportId = 0x02;
    input->setValue((uint8_t*)&a,sizeof(a));
    input->notify();

    input->setValue((uint8_t*)(&keyboard_report), sizeof(keyboard_report));
    input->notify();

    inputConsumer_t b{};
//   b.reportId = 0x01;

    b.ConsumerControl = volDirUp ? 0xE9 : 0xEA;
    volDirUp = volDirUp ? false : true;
    inputVolume->setValue((uint8_t*)&b,sizeof(b));
    inputVolume->notify();   

    inputVolume->setValue((uint8_t*)&consumer_Report,sizeof(consumer_Report));
    inputVolume->notify();  

    delay(1000);
    digitalWrite(ledPin, LOW);
  }
}

Does this have a license? I'm hoping to try this out in a project i am planning.

Hallo ematt,
thanks for this snippet! Am I allowed to use it as a starting point for my next project?

@FloxCode, @cartufer
It was a long time ago I can't really remember how I got this, but it seems to be based on
As for my work on this gist, everybody is allowed to use it for whatever they want

Thanks a lot! I already tried it out and it works with at least 3 devices I could try. So next step is to understand your code and fit it to my project.

@ematt good job sir!!!!!!!! You are a genius, may you tell me if i use with a mpu 9250 can i make works for BT hid with laptops, android ,iPhone, etc like a Air mouse controlling the cursor? And could you help me with Code on esp-idf? Thanks!!