Import coreMQTT to Tiva

Hi @Ping

For a DNS lookup, it is important to set the following config items:

#define	ipconfigDNS_RECEIVE_BLOCK_TIME_TICKS    pdMS_TO_TICKS( 2500U )
#define	ipconfigDNS_SEND_BLOCK_TIME_TICKS       pdMS_TO_TICKS( 2500U )

This example puts them to 2.5 seconds, but you may choose a longer period.

If these values are not defined , the default values are :

#define	ipconfigDNS_RECEIVE_BLOCK_TIME_TICKS    pdMS_TO_TICKS( 5000U )
#define	ipconfigDNS_SEND_BLOCK_TIME_TICKS       pdMS_TO_TICKS( 500U )

You can also look at this topic for more reference.