AT+CIPMUX AT command is used to start a multi-IP connection.
To get the supported values, AT+CIPMUX=?
+CIPMUX:(0,1)
OK
To read the current setting, AT+CIPMUX? +CIPMUX:1
To set up a single IP connection, AT+CIPMUX=1 OK
To set up multi-IP connection AT+CIPMUX=2 OK