Hi, I use the nrf 8001C + stm8s. I successfully installed settings nrfGo, but when I try to execute a command OpenAdvPipe I get an error ACI_STATUS_ERROR_CMD_UNKNOWN. The command OpenAdvPipe consists of: OPENADVPIPE [] = {9,0x1B, 0x02,0,0,0,0,0,0,0}; If I understand you need to sent the number of the pipe. Settings in nrfGo studio to check and they can not correct . Tell me what to do with this error . Thank U!