Socket error: timed out while using RAK Wis Cellular


I am using hologram sim with RAK Wis Cellular LTE Arduino Shield, but when sending a message to the device it’s throw**:Socket error: timed out** . but when I tried the simulation service no problem at all.

I was using AT command to send the message. the commands are below.

AT+QICSGP=1,1,“hologram”,"","",1 // Set APN network to hologram
AT+QIACT=1 // Activate the APN network
AT+QIACT? // Query the APN assigned IP address
AT+QIOPEN=1,0,“TCP”,“”,9999,0,1 // Create a TCP, connection hologram test server
AT+QISEND=0,48 // Send data, send data length is 48
{“k”:“devicekey”,“d”:“Hello,World!”,“t”:“TOPIC1”} //Send Packets.The data format is