BLE HID with android on google pixel

[ChaitanyaP]

HI experts

I have a nRF51-DK board. I have flashed it with S130 softdevice. I have also flashed it with BLE_APP_HIDS_KEYBOARD application example. I have made little change in source code.

I see that

hello string is defined in

static uint8_t m_sample_key_press_scan_str[] = /**< Key pattern to be sent when the key 


press button has been pushed. */
{
    0x0f,                                      /* Key h */
    0x0c,                                      /* Key e */
    0x13,                                      /* Key l */
    0x0f,                                      /* Key l */
    0x37,                                      /* Key o */
    0x2b                                       /* Key Return */
};

i changed this code with

#define KEY_1 0x1e // Keyboard 1 and !
#define KEY_2 0x1f // Keyboard 2 and @
#define KEY_3 0x20 // Keyboard 3 and #
#define KEY_4 0x21 // Keyboard 4 and $
#define KEY_5 0x22 // Keyboard 5 and %
#define KEY_6 0x23 // Keyboard 6 and ^
#define KEY_7 0x24 // Keyboard 7 and &
#define KEY_8 0x25 // Keyboard 8 and *
#define KEY_9 0x26 // Keyboard 9 and (
#define KEY_0 0x27 // Keyboard 0 and )

static uint8_t m_sample_key_press_scan_str[] = /**< Key pattern to be sent when the key 
    
    
    press button has been pushed. */
    {
        KEY_1;
        KEY_2;
        KEY_3;
        KEY_4;
        KEY_5;
        0x2b                                       /* Key Return */
    };

and also made changes in key press event

 case BSP_EVENT_KEY_0:
				{
												
							
									
        if (m_conn_handle != BLE_CONN_HANDLE_INVALID)
        {							
            keys_send(1, p_key);							
            //p_key++;
            size++;
						keys_send(1, (p_key+1));							
            //p_key++;
            size++;
						keys_send(1, (p_key+2));							
            //p_key++;
            size++;
						keys_send(1, (p_key+3));							
            //p_key++;
            size++;
						keys_send(1, (p_key+4));							
            //p_key++;
            size++;
						keys_send(1, (p_key+5));							
            //p_key++;
            size++;
            if (size == MAX_KEYS_IN_ONE_REPORT)
            {
                p_key = m_sample_key_press_scan_str;
                size  = 0;
            }
        }
				

				}
        break;

i have modified above code to send multiple characters with single button press.In original source code provided by nordic, only one character is sent on single button press. rest everything is as kept as it is.

After making changes the expected string is

12345

this string is coming alright on i OS 10 devices. I have tested this with iPhone 5. when i started testing with android devices (google pixel) i noticed strange behavior. Sting received on android device is

12345555 (last character repeats itself random number of times).

I am unable to understand why. Can some one help me understanding this.

[Sigurd]

Hi,

I tested this on Samsung S6 running Android 6, and it worked fine. What Android version are you using on the Google pixel phone? I suspect this could be a bug with the Pixel phone since we are not able to reproduce this on other phones. Upgrading to the latest Android version could perhaps fix the issue.

---

Note: I had to switch out the semicolon with a comma in m_sample_key_press_scan_str for the code to compile, i.e.

press button has been pushed. */
{
    KEY_1,
    KEY_2,
    KEY_3,
    KEY_4,
    KEY_5,
    0x2b                                       /* Key Return */
};