RE: Maximum NUS data length

Pero Krivic — Fri, 28 Jan 2022 11:59:36 GMT

Hi, thanks for the answer. Do you mind pointing me to where to find out what MTU is (in the Nordic SDK sense) and how to use this negotiation?

RE: Maximum NUS data length

Sigurd — Fri, 28 Jan 2022 11:18:52 GMT

Hi,

[quote user=""]maximum data length is 20 bytes per single TX/RX action. Is that true?[/quote]

Yes, that is the default, as defined in the Bluetooth spec. It can be negotiated higher(if both central and peripheral supports higher MTU) with a MTU Request/Response procedure.

[quote user=""]Now, if I wanted to send a longer string of data, what would be better approach, to use the NUS or move on to some other service?[/quote]

NUS is perfect for sending strings.

[quote user=""]my smartphone refuses to send more than 20 characters[/quote]

If you have a old phone, it might not support long MTU.