how to save sending package lost data

[happykelvin]

how to save a problem,if one Thread use sd_ble_gatts_hvx() send many package ,but i use vTaskDelay(50)( the freertos delay api ) when one package send ,then send another package . but
some packgae lost data .At the same time other Thread use sd_ble_gatts_hvx() send package ,if someone package lost data ,how i seek the problem and save the problem...

[RK]

This is the 4th time you have posted this today - stop it and wait for someone to answer one of your previous questions.