Maximum data throughput.

[Jorge]

I wanted to know what's the maximum data throughput if one device has both roles (Client/Server) working at the same time. I already saw the tables for the different SoftDevices (s110, s120 and s130) but not sure if the maximums they display are for one way only or for the two. I want to use this so I'm able to full duplex audio transfer over BLE, but want to know what's the maximum data I can send/receive on both sides (Central/Peripheral). thanks in advance for your answers

[FormerMember]

S130 and S132 v.2.0 supports up to 6 packets per connection interval per connection, no matter if the device is central or peripheral. However, the minimum connection interval depends on the number of connected links.

For one connected link, central or peripheral, the minimum connection interval is 7.5 ms.

For two links, the minimum connection interval is 15 ms if you want to be able to transmit 6 packets per connection interval per link.

As you understand, if you want to be able to transmit 6 packets per connection interval, the connection interval has to be at least total number of connected links * 7.5 ms. The reason is that it requires some time to transmit packets over the air, and more packets to transmit, more links, require more time.

[Jorge]

I also had this problem sending from the central to the peripheral (write without request), getting only 1 packet for connection, which give me a 27kpbs. But if i send from the peripheral to the central by notification I have a throughput of 137kbps. both on, I have 27kbps from the central and 125kbps from peripheral which give me a 152kbps on the worst cases. I think I'm only sending one packet because I'm not defining the bandwidth to high on the central side, but still have to look. To count the packets you can use BLE_EVT_TX_COMPLETE, yes. I'm using another variable, because I'm using NUS also.