Is there some sort of assurance that ble packets get to the application undamaged and in the correct order?

[manusic]

Hey Guys,

im working on some sort of application transport layer for ble and have some questions to better plan what i need and what is kind of redundant. Is it correct that in the lower layers of the ble stack there is a crc check for every packet and the packets get retransmitted in case of error? Because write_request and indications are drastically limiting the troughput so only writes and notifications should be used to send messages consisting of multiple successive send operations. So is there a chance of packetloss without recognizing it ? Chip is nRF15422 with Softdevice S310.

Thank you for your help :)

[run_ar]

BLE_EVT_TX_COMPLETE includes a count of the number of freed buffer spaces. So if you have room for 7 packets this will vary between 1-7, it does not wait for all the buffers to be freed.