Which is the call back for BLE Custom Characteristic Value Read

[Deepa Gopinath]

Hi all,

At Peripheral end, I will get an callback "BLE_GATTS_EVT_WRITE" whenever I do a write on charcteristic write value from Mobile App. 

Can you please point me to the callback need to be registered for the read of charcteristic write value from Mobile App?

As per my application i have defined by attributes as below to  write charcteristic write value from Mobile App. 

attr_char_value.init_len = 1;
attr_char_value.init_offs = 0;
attr_char_value.max_len = 1;

So custom characteristic value length is 1 and datatype is uint8 (default)

How can I change my datatype of Custom characteristic Value?

Thanks in Advance!!

Regards,

Deepa

[Kenneth]

Hello,

You can find the message sequence charts the events that will occur:
http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.s132.api.v6.1.0/s132_msc_overview.html?cp=2_3_1_1_0_1 

Typically you will not be informed of any event when a peer read a characteristic, unless you enable authorization on the characteristic, then you will get an event every time the peer try to read the characteristic:
http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.s132.api.v6.1.0/group___b_l_e___g_a_t_t_s___r_e_a_d___r_e_q___a_u_t_h___m_s_c.html 

You can transfer any kind of data, just cast the data to (uint8) and then convert it back afterwards.

Best regards,
Kenneth