nRF8001 wake up fails sometimes

[weil]

Hi,

I meet a very strange situation when I tried to wake up nRF8001 from sleep. I send 0x05 to nRF8001, it replies me ACI command 0x40 is unkown (0x82). I have checked sending buffer when I got this error, command is 0x05 indeed.

It happens randomly, like 1 out of 8 times.

[weil]

MCU is STM32F103RE. SDK is ble-sdk-arduino. The other commands are normal, actually BLE function is good. I am using lib_aci_wakeup(). I dont have logic analyzer for now. guess if there is anything else to do before sending waking up command?