How to correct a value of characteristic in spec. range

RE: How to correct a value of characteristic in spec. range

Hung Bui — Wed, 18 Mar 2015 14:14:51 GMT

@Jason: thanks, it's good to know. I forgot to follow the UriBeacon :)

RE: How to correct a value of characteristic in spec. range

Jason — Wed, 18 Mar 2015 13:37:28 GMT

Hi Hung, Yes, 1-99 to be 100, that is Google UriBeacon Specification.

RE: How to correct a value of characteristic in spec. range

Hung Bui — Wed, 18 Mar 2015 11:51:02 GMT

Hi Jason, I think your implementation is OK. I'm not sure about the range of beacon_period in your application, but it seems at line 525, you will correct any beacon_period value between 1-99 to be 100 ?

RE: How to correct a value of characteristic in spec. range

Jason — Wed, 18 Mar 2015 11:18:37 GMT

I had tried to return SUCCESS then using sd_ble_gatts_value_set(), and success to correct the value. Please see the line no. 518-528 of the source code..

RE: How to correct a value of characteristic in spec. range

Hung Bui — Wed, 18 Mar 2015 11:01:39 GMT

@Jason: You can return success, but make sure you correct the value after it is set by the softdevice (when you reply with success). The attribute value will be written twice.

RE: How to correct a value of characteristic in spec. range

Jason — Tue, 17 Mar 2015 16:45:50 GMT

The spec. need to return the SUCCESS and correct the wrong value automatically.

RE: How to correct a value of characteristic in spec. range

Hung Bui — Mon, 16 Mar 2015 17:29:23 GMT

Hi Jason, Setting my_value = 100 won't help to change the value will be written to your attribute. The assignment attr_char_value.p_value = (uint8_t *)&my_value; is only set the initial value of the attribute.

When you call sd_ble_gatts_rw_authorize_reply with gatt status = NRF_SUCCESS the value that the central set will be written to the atrribute value.

When the value being written is out of the range, you should better to reject the write command and then either wait for another write request with in-range value or set the value to maximum 100 locally by using sd_ble_gatts_value_set().