how is refreshAdvertisingData supposed to work?

[vladtepesch]

How is refreshAdvertisingData supposed to work?

The function uses the internal m_advData to that only a const reference is available.

I esspecially can not see the use advertised in the documentation "For instance allows refreshing manufacturer data dynamically."

I tried to update the manufacturerdata with "NimBLEAdvertising::setManufacturerData" but I always get a "Data length exceeded" error (my data is 12 Byte), because it seems that setManufacturerData always tries to append data to payload instead replacing the old data"

[h2zero]

You will need to reset the advert data first to change the manufacturer data, this is a limitation due to advertising data structure as the new data length may not be the same as the old data causing errors. refreshAdvertisingData just exists to tell the stack that the data has been changed, once all the changes are done, without having to stop and restart advertising.

[vladtepesch]

Ah okay - thanks. Now I see. the refreshAdvertisingData is only required if one changes the data via the NimBLEAdvertising functions and not creating and setting a NimBLEAdvertisementData.
I think the design of NimBLEAdvertising is a bit strange, especially the doubled responisibilty and functionality of the Advertising and Data class