First UDP packet is delayed more

chethu gowda

Genius 4090 points

Other Parts Discussed in Thread: MSP430FR5739

I am trying to calculate the latency involved in communication between my device and the cc3000

connection is as below,

UART SPI

My device ----------> MSP430FR5739 --------> CC3000

Here I am sending the UDP packet from CC3000 to same CC3000's IP address and UDP port number. Using separate sockets for sending and receiving.

I can see that delay of first UDP packet to return has more latency (7.72ms) compared to the next all UDP packets (2.92ms).

What could be the reason?

0 Yael Oz over 13 years ago

Hi,

The first packet sent will trigger an ARP request if the IP is not in the ARP table.

This could be the reason for the delay.

You can confirm this with a sniffer capture.

Yael

0 Nabeel Syed over 11 years ago in reply to Yael Oz

Hi,

Actually my first udp packet that I send from cc3000 never gets send although subsequent udp packets are sent fine .

What could be the reason. I am using same dev board as above with latest 1.11 patch and using wireshark for sniffing.

please advise

Thanks

Nabeel

Wi-Fi forum