GATT Server - Write or Write without Response characteristic sample

[pekon94]

Hello,

is there a zephyr or nrf sample where I could check how a characteristic with write or write_withour_resp perimissions is handled by the gatt server ?

What I am trying is to find out how the gatt server can process the data written by a gatt client.

Thank you in advance

[pekon94]

Thank you for this. 

I will give it a try and let you know. 

I am using my mobile phone as the central, using the nrfconnect app for android. Then I am writing different values for uint16_t data. 

[Kenneth]

Out of curiosity, what data do you write and what data do you receive when it fails? What happens if you just transfer one character?

Can you make the 'write_data ' static.

Kenneth

[pekon94]

I will upload screenshots later today

[pekon94]

Hello Kenneth,

please see the following screenshot. On the left you can see the nrfconnect bluetooth low energy (I am using an nrf52840 dongle) and on the right you can see the result of the printk from the nrf5340 GATT server. For the code, please see my previous comment.

[Kenneth]

Since you are witing a hexidecimal value I think it make more sense to also output a hexcidecimal number, e.g. %x instead of %u. I am also a bit sceptical to to the memcpy(write_data, attr->user_data, sizeof(attr->user_data)), since you are not really checking the actual length of the received data.

Kenneth