Transmit Large Data 518222

[Sergey]

Hi!

I have a Nordic nrf51822-DK. I'm need send large data to the Android phone (10 mb). I'm use sample devzone.nordicsemi.com/.../dealing-large-data-packet-s-through-ble , but speed very low (one minute passed 10 kb).

BLE can transmit at speeds of up to 2Mb (www.nordicsemi.com/.../nRF51822).

How speed up data rate?

[Ole Morten]

A sd_ble_gatts_hvx() call, which is what ble_hrs_heart_rate_measurement_send() does, will transmit up to the characteristic size. To make it transfer 20 bytes, you should therefore make sure that the characterstic is defined to be 20 bytes when initializing it. To better understand how to create a custom service and characteristics, I'd recommend you to take a look on nAN-36: https://www.nordicsemi.com/eng/content/download/34055/573345/file/nAN-36.zip

[Muhammad Akram Karimi]

Hi Hakon,

I need to send large amount of data from server to client in minimum possible time.

Can you please tell me how can I send exact 6 packets (6 calls to sd_ble_gatts_hvx) per connection interval?

Is it something you just mentioned as an example?

I have gone through Ole Code Snippet but have some questions:

- what is m_rr_interval_enabled and its use?


- When is BLE_EVT_TX_COMPLETE event raised?


Let's say, I have an array of 1024 bytes which I want to send into 64 chunks of 16 bytes (assume characteristic has length of 16 bytes).

Should I just call sd_ble_gatts_hvx 64 times?

When is BLE_EVT_TX_COMPLETE event raised in that case?

Thanks