How to do Packet Retry when the Acknowledgement has not been received

Question

1.86/5 (5 votes)

See more:

I want to Retry a packet transmission on UDP if neither ACK nor NACK is received. Then in that scenario i will wait for 500 milliseconds till i retransmit the packet.

Posted 13-Apr-15 0:30am

Prerna_Sharma

Updated 14-Apr-15 1:01am

v3

Add a Solution

Comments

Frankie-C 13-Apr-15 6:55am

And the question is?

Richard MacCutchan 13-Apr-15 6:57am

What packet, what protocol, what connection type ... ? Basically, what are you talking about here, we cannot guess.

CPallini 13-Apr-15 7:42am

Hence go on, go on..
What is your doubt?

Prerna_Sharma 14-Apr-15 7:57am

Can you please help me now ??

Albert Holguin 13-Apr-15 13:02pm

If you're using TCP/IP, this happens automatically without you doing anything. You have to provide more info on what you're trying to do and what protocols you're using.

Mohibur Rashid 14-Apr-15 7:04am

Good point

jeron1 14-Apr-15 10:08am

So is your question more about setting a 500ms timer?

Richard MacCutchan 14-Apr-15 10:50am

Then you need to design your own protocol to check meesages and use a timer to see whether you heve received responses. This is not a simple exercise. Switch to TCP/IP and the system will do it for you.

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Dave Kreskowiak · Answer 1 · 2015-07-02T09:34:00

Why are you trying to implement this on UDP? TCP does this for free.

UDP is connectionless and do not guarantee packet delivery at all, let alone the packets getting there in the correct order.

If your requirements are anything other than the above, use TCP instead.

Oh, and UDP doesn't implement any kind of acknowledgment. The sender never gets anything from the receiver saying that it did or did not receive a packet or message.

david21114 · Answer 2 · 2015-06-24T10:50:00

Solution 1

UDP is a connectionless protocol.

There is no handshaking going on.

There are no acks and nacks between the client and server

Try using zeromq.

http://zeromq.org

Posted 24-Jun-15 10:50am

david21114

Updated 24-Jun-15 10:52am

v2