How can I make sure I have a successful send message

ChirpStack Application Server
1

I used mqtt send message application/[applicationID]/device/[devEUI]/tx,

mosquitto_pub -h 120.77.155.191 -t “application/5/node/004a770066003304/tx” -m “{“reference”:“abcd1234”,“confirmed”:true,“fPort”:10,“data”:“123123”,“object”:{“temperatureSensor”:{“1”:25},“humiditySensor”:{“1”:32}}}”

in Live LoRaWAN frame logs I can see downlink message, but I can not know what it is

YYOLO7~3%5D0%7B)~7YUDA)U94I
YYOLO7~3]0{)~7YUDA)U94I.png1033×499 23.1 KB

I install these server by docker install , .