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MSP432E401Y: MQTT server connection problem.

Part Number: MSP432E401Y

Hello,

We are using MSP432E401Y launch pad.
We find one problem in MQTT server library.
We are using SDK version 4.20.0.12.

We are using "mqttclientserver_MSP_EXP432E401Y_freertos_ccs" example for test MQTT client and MQTT server.
Here is some test case.
case 1 : Launch pad connect with router and router have internet connectivity. Mobile MQTT client able to connect with Launch pad MQTT server. if mobile client connect disconnect multiple time then it is done successfully.
case 2 : Launch pad connect with router and router have internet connectivity. Mobile MQTT client able to connect with Launch pad MQTT server. Then remove internet and disconnect MQTT client , try to connect (after 20 sec) MQTT server using mobile MQTT client then it is not able to connect.
case 3 : Launch pad connect with router and router don't have internet connectivity. Mobile MQTT client not able to connect with Launch pad MQTT server. it always fail.

Final observation statement is that whenever there is not internet connectivity in router then Mobile MQTT client not able to connect with local MQTT server.

Our requirement is that MQTT server functionality should not depend on internet connectivity.  We check for CC3220 MQTT server is not depend on internet connectivity.

How can we overcome with this problem?

Thanks,
Dinkar