Increasing Throughput

[David]

Hello

According to BLE Specifications we should be able to get 125kbits/s over the air transmission i cannot seem to get anything remotely close to this.

Is there something special that needs to be done to achieve this type of throughput?

 

I am sending 100 packets each 10 bytes long and this will take as long as 10 seconds to send / receive all packets.

and takes 40 seconds if i wait for BLE_GATTC_EVT_WRITE_CMD_TX_COMPLETE and BLE_GATTS_EVT_HVN_TX_COMPLETE events before transmitting the next packet

 

Regards,

David Hutchinson

[ovrebekk]

Hi David

Are the devices on both sides Nordic devices, or do you have some other device on one side?

Do you know the connection parameters used for the BLE link?

In general you want to keep the connection interval short for quicker BLE transmission.

Also, if you send more data in each packet you should be able to speed things up. Are you able to buffer multiple 10 byte updates into a single packet before you send it?

Best regards
Torbjørn

[awneil]

ovrebekk said:

do you have some other device on one side?

In particular, Android and iOS both put limits on the allowable connection parameters.

In addition, a particular phone may further restrict it - and it may differ if you disconnect and immediately reconnect!

See: https://devzone.nordicsemi.com/f/nordic-q-a/42624/ble4-transfer-speed-slower-on-iphone8-x-than-5-6-7/166097#166097