How to send multi packet and is there any example?

[KKIM.6]

I want to send 2 kbyte data using BLE in WB55.

Becasue the packet size is limited to 245 byte (it may be 509 byte if change ATT-MTU to 512 but still I couldn't make it.)

So, I wonder whether there is good example for this.

Could you suggest anything?

[Javier1]

You just chunk it down to 245 byte packets.

Im not sure im understanding your issue.

[KKIM.6]

If I divide data into 10 set, there maybe missing data during transfer. Then how can I solve it?

[Javier1]

You could ping pong the same data and check if it matches, maybe some CRC, or your own custom header wrapping your payload.

[KKIM.6]

In addtion, if I request 10 times...because of conenction interval, transfer 2kbyte would take 75 ms (in 7.5 ms connection interval). Isn't it?

I heard that BLE can send 2~2.5 packet(245 byte) in single connection interval (7.5 ms).

Isn't it?

[KKIM.6]

In addtion, do you know how to use aci_gatt_update_char_ext to send 512 byte once?

I need example for this but I cannot find any useful example among company provided.