Increase transfer rate. MIDI BLE

RE: Increase transfer rate. MIDI BLE

manuwind — Tue, 29 Sep 2020 09:12:37 GMT

Solved by adding MTU negotiation procedure. This increased the packet length from 20 bytes to 244 bytes.

RE: Increase transfer rate. MIDI BLE

manuwind — Mon, 31 Aug 2020 10:52:29 GMT

My main question is, can we update the notification characteristic more than once per connection?

The other option would be to increase /renegotiate the MTU. Am I right?

RE: Increase transfer rate. MIDI BLE

manuwind — Fri, 28 Aug 2020 22:53:38 GMT

Thank you and sorry for my late reply. For any reason I didn't get the notification.

1. The peripheral is a MIDI controller. The Central can be a Macbook Pro 2015 or an iPad Pro.

2. The payload can be from a single MIDI realtime (1 byte) message to a bunch of MIDI messages that don't fit into one single 20 byte notification package.

3. 7.5 ms is already a considerable latency.

Regards,

RE: Increase transfer rate. MIDI BLE

haakonsh — Wed, 26 Aug 2020 08:42:34 GMT

Setting max connection interval to 12ms can be detrimental to the negotiated connection interval given what Central is controlling the link, if the max CI is too low the Central might use its default value that could be anywhere from 7.5ms to several seconds.

What devices are the Peripheral and the Central?
How big is your payload?
How low latency do you need?