busy when beacon event

[emj365]

Is that normal?

AT+RST

OK
L(����ZN�bZS����DLJK�l�
[Vendor:www.ai-thinker.com Version:0.9.2.4]

ready
Wifi initialized
AT+CWMODE=1
no change
AT+CWJAP="none","xxxxx"

OK

AT+CIPMUX=1

OK
Wifi connected
192.168.31.243
AT+CIPSERVER=1,80

OK

AT+CIPSTO=300

OK

AT+CIPSTART=2,"UDP","192.168.31.255",-30729

OK
AT+CIPSEND=2,82
> {"event": "beacon", "ip": "192.168.31.243",": "wifi-serial"}
busy s...

SEND OK
AT+CIPSEND=2,82
> {"event": "beacon", "ip": "192.168.31.243",": "wifi-serial"}
busy s...

SEND OK
AT+CIPSEND=2,82
> {"event": "beacon", "ip": "192.168.31.243",": "wifi-serial"}
busy s...

SEND OK