Maximum data throughput using S120 client and S110 server

[John]

Hello,I have a problem with data throughput. I use S120 for client and S110 for server. I set connection interval to 7.5( min connection interval and max connection interval equal to 7.5) for client and server. I have to transmit 4 kbytes of data.

I tried to send data using both notification and indication. If I use indication, I send first packet after that I wait to receive BLE_GATTS_EVT_HVC, and when I receive this event, I send next packet of data. If I use indication, I send first packet of data , I wait BLE_EVT_TX_COMPLETE, after that I send next packet of data. In both case, the packets have the same length(20 bytes). Why in both case , maximum data rates is 1.3 kbytes/s, although in s120 specifies maximum data throughput for one slave and 7.5 ms connection interval is 2.66 Kbytes/s?

[Petter Myhre]

When you use notifications you shouldn't wait for BLE_EVT_TX_COMPLETE every time you send a notification. You should send notifications until you get BLE_ERROR_NO_TX_BUFFERS, then you should stop until you get BLE_EVT_TX_COMPLETE. Please see this for more information.

[John]

Thank's a lot Petter Myhre!