MQTT: module return ERROR when publish packets

Hello, everyone!

After I publish about 6-10 packets continuously (each packet is larger than 200 bytes), then when I send next packet I get ERROR response from module. And the module continuously returns ERROR when I publish packet. ( when I execute other at commands the module still executes very quickly and accurately).

I really don’t know the reason. Because of the module (I think not), because of the MQTT server, or because the network operator limits the number of packets (or has restrictions on sending data), …

And what is the solution here? more delay between sending at command or some other way.

Please help me explain! Thank you so much!


How long between each packet?