for example ，the"current-operator" or "rssi" or "rsrp" can display,but can`t get and log in message,the "sinr" was get OK and in message
/interface lte monitor lte1 once do={
:set $1isp $("current-operator")
:set $1rsrp $("rsrp")
:set $1sinr $("sinr")
:log info message="ISP.$1isp"
:log info message="RSRP.$1rsrp"
:log info message="SINR.$1sinr"}