RS9116
Standby
Associated, DTIM = 10 / 51uA Wi-Fi (1 second beacon listen interval). 
SLEEP_IND_FROM_DEV
output pin > to wake up MCU. 
ULP_WAKEUP
input pin. > MCU to wake up  RS9116 
1.     
RS9116 auto joining Wifi AP router after power on > Yes. 
Our RS9116
use AT command , MCU can give us SSID and passwords to joining the AP router
when power on.