nRF52 Error 8 by sending string

[1_andi]

Hi, I’m currently trying to send strings about Nordic UART Service. In use are two nRF52832 Develop boards. One as Central and one as Peripheral. The connection works fine and I can read and write the battery level. My problem is that I can’t send strings over NUS. It views Error 8 (NRF_ERROR_INVALID_STATE). When I connect my peripheral with an Android Handy, send and receive will work fine. Only I connect both nRF52 it get Error only in NUS. My central application deduced from example/ble_app_hrs_c and the peripheral from example/ble_app_hrs. What can I do for sending strings from peripheral to central and back? Thank you.

[Ole Bauck]

Which function is returning NRF_ERROR_INVALID_STATE? If it is ble_nus_string_send(..), then probably notifications is not enabled. Could you check if this is the case?

[1_andi]

The function ble_nus_string_send return NRF_ERROR_INVALID_STATE. My opinion is that the uuid was wrong parsed. But I don't find the mistake.

[1_andi]

I checked the notification and gives back false.

[Ole Bauck]

Then the central have not enabled notification in CCCD. This may be because of wrong CCCD handle. Could you attach the code in the question or send it to me? Have you looked at the ble_app_uart_c example in SDK 10?