Maximum troughput with 3 peripherals and one central

[Constantin]

Hi,

I am planning two have the following network:

1 central communicating with 3 peripherals

One of the peripherals will be a smart device (iOS or Android). What would be the maximum through put. From my understanding the minimum connection interval is 7.5 ms and the nRF52 is capable of sending 6 packages in between this interval. But does this mean for three peripherals that the central can send 2 packages two each peripheral in between one interval?

iOS only supports intervals down to 30 ms. This would mean that if an iOS device is inside the network the throughput will reduce by factor 4?

And last questions doe a package send always mean both ways? So the central sends one package and the peripheral answers?

Thanks for your help.

[endnode]

Surprisingly nRF52832 is BT5 as well and even more surprisingly BT5 doesn't make larger throughput through more PDUs/MTUs but through data rate. And because both nRF52832 and nRF52840 support 2Mbps they will have basically equal maximum theoretical throughput.

Now as you use nRF52832 I suppose you are talking about S132 V3 stack (note that there are other Open Source options which can provide different maximums!) and it has indeed detailed section about theoretical maximum throughput in its specification here. If you want to convert these back to PDU/MTU numbers per interval in relation to connection interval used and number of parallel GAP Central links then read this and this blog post as well as this section from SD specification.

[Constantin]

So to be a bit more specific I plan the following scenario.

There are two sensors (peripherals) and one remote (central) and one smart device (peripheral, iOS or Android). Since iOS only supports 30 ms minimum connection interval the overall connection interval will be 30 ms?

Then it is possible to send 6 packages in between one connection interval this means the remote (central) can exchange with each peripheral one package. Is this correct? The only change for BT 5.0 will be the amount of bytes per package which can be sent.

Thanks again,

Constantin