How to read a characteristic value?

[Sandeep singh]

HI,

I get confused using the ble terms hence i'll try to articulate my query as much as possible. I'm using  the nRF52832 board and all i  have one service with one characteristic,

the characteristic has read,write and notify properties. I have implemented the write and notify option perfectly but have trouble with the read property of the characteristic.

What I want to do is to  connect my device(nRF52832) to nRF connect app and use the read option to get data from device(nRF52832). 

For example: using notify, after every notification interval i'm incrementing a variable by 1, now i stop the notification using nRF connect when the variable value is 5, when i hit read on the app, it should show the same updated count(count=5).

Ps: I have created a custom service with one characteristic.

Again sorry for not using the BLE terminologies here but i have tried my best to articulate my issue without it.

[Sandeep singh]

Hi ovrebekk thanks for the reply,

Yes after disabling the notification from the app when i do a read request, it shows me the value that i had used while initializing the characteristic.

for ex:

value=2;

 add_char_params.p_value=&value;

i increment the "value" for every notification interval. After stopping the notification interval when i hit read, i get the output as 2 only.

[ovrebekk]

Hi Sandeep

When notifications are disabled you won't be able to send notifications. 

If you use the sd_ble_gatts_value_set(..) function instead it should work. This will change the value of the local attribute, and once you read it from the app the updated value should be reflected. 

Best regards
Torbjørn