- return ERR_MEM when softap power queue is full
- remove some unused code and function
- do not rewrite flash when set station config
- wait 20~40ms before close RF when station received unicast packet from ap
- set default DTIM period to 1 when ESP8266 in softap mode
- fix authmode in scan record is open when scan WPA2/WPA3 router
- add esp_wifi_set_11b_tx_plcp api for signal test
- fix baudrate is incorrect when esp_restart called