RE: Maximum posibble connection Interval

Kenneth — Mon, 20 Feb 2023 14:36:23 GMT

Hello,

As a peripheral device you typically have gap_params_init() and conn_params_init() somewhere during init.

The conn_params_init() will try to update the connection parameters to fullfill the paramters you defined in gap_params_init().

So, if you want to fullfill the following:

[quote user=""]Interval Max * (Slave Latency + 1) ≤ 2 seconds[/quote]

Then you can for instance try to set either of these:

MIN_CONN_INTERVAL=MAX_CONN_INTERVAL=2seconds and SLAVE_LATENCY=0
MIN_CONN_INTERVAL=MAX_CONN_INTERVAL=1seconds and SLAVE_LATENCY=1
MIN_CONN_INTERVAL=MAX_CONN_INTERVAL=0.5seconds and SLAVE_LATENCY=3
...

[quote user=""]is there the same document for android you are aware of? (I couldn't find myself)[/quote]

Not that I am aware of either, but the apple guidelines seems to work for anyone.

[quote user=""]Then my first question is how to select the connection parameters to reach the 4s connection interval.[/quote]

That is not possible if you want to fullfill the apple guidelines, but if you don't care about those, then it would be something like:

MIN_CONN_INTERVAL=MAX_CONN_INTERVAL=4seconds and SLAVE_LATENCY=0

[quote user=""]Is it possible to send empty packets for 10 minutes?[/quote]

From a BLE specification point of view that is possible yes, whether the peer device (e.g. phone) allow this without disconnecting is a different question (I don't know). It could be that a phone disconnect if it's inactivity for x number of minutes.

Kenneth