Got it working.. forgot (didn't know) I had to change the attribute length as well
I am currently trying to figure out where/how to attach my measurements so they can later be requested by a central when in a connection (and for the time being with the nRF Master Control Panel on Android. Is the Android Master Control Panel able to do this (enable services)?)
I would like to send 2x byte, 1x int32, 1x uint32.
I am currently playing around with gatts_value but I am struggling with sending values other than uint8_t
uint8_t temp_temp = 5;
ble_gatts_value_t test_value;
test_value.offset = 0;
test_value.p_value = &temp_temp;
test_value.len = sizeof(temp_temp);
sd_ble_gatts_value_set (m_conn_handle,m_char_handles.value_handle, &test_value);
If I got e.g. a variable: int32_t cool_name and want to use that, how to do that? I found this Post and tried this:
uint32_t temp_temp = hole_druck();
ble_gatts_value_t test_value;
test_value.len = 4;
test_value.offset = 0;
test_value.p_value = (uint8_t*)&temp_temp;
But it did not work.
(To minimize current consumption the central shall later on be able to request these measurements every 4 seconds. And both shall turn their radios off in between. And the peripheral should based on the last request start a timer to get fresh measurements from the sensor. Is this the right way to go for this?)
