access characteristic value

RE: access characteristic value

Nikita — Sun, 31 Aug 2014 16:24:16 GMT

Yes, you can use it like this. Server will update characteristic value inside softdevice on write ond after this send BLE_GATTS_EVT_WRITE event to your application and you can store and use this value inside your application and don't get it with sd_ble_gatts_value_get() every time. You just need to handle BLE_GATTS_EVT_WRITE event and update your bool variable and as well update it if you call sd_ble_gatts_value_set() for this characteristic anywhere inside your application.

RE: access characteristic value

michurin — Sun, 31 Aug 2014 16:12:21 GMT

OK, let's take another look. If the server will update the value of this characteristic on write event and then will access to it without using sd_ble_gatts_value_get(). This looks easier but is it kosher? From other hand sd_ble_gatts_value_get() will probably take more effort to access every time it's needed but may be more legit. The characteristic I have in mind is bool and I don't feel comfortable using sd_ble_gatts_value_get(0 every time instead of if.

RE: access characteristic value

Nikita — Sun, 31 Aug 2014 15:39:51 GMT

BLE_GATTS_EVT_WRITE event will be generated when client will write some data in this characteristic, after this value was received server will save this value as current characteristic value.

With sd_ble_gatts_value_get() call you can get current characteristic value at any time and place you want.