How can i know num_packets?

[ENENER]

I want to find out BLE throughput.

Throughput_bps = num_packets * (ATT_MTU - 3) * 8 / seconds.

In this equation, how can I find out num_packets?

 

Also, ATT_MTU = 23?(/** @brief Default ATT MTU, in bytes. */  #define BLE_GATT_ATT_MTU_DEFAULT 23) when default code?

[Amanda Hsieh]

Hi, 

You could read and understand this article, where a formula is presented and explained, that lets you calculate the number of packets in a connection interval.  The default Maximum Transmission Unit (MTU) is 23 bytes. When increasing this value, longer ATT payloads can be achieved, increasing ATT throughput. See this https://punchthrough.com/maximizing-ble-throughput-part-2-use-larger-att-mtu-2/

-Amanda H.