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copied!<p>Well, what makes a network connection "slower" than another, is due to latency and/or bandwidth. So if you want to have a realistic simulation, you need to find the bandwidth of your mobile phone connection, as well as its latency, and simulate that in your client program. </p> <p>But you seem to imply that you send very little data, so bandwidth is probably not really going to affect your connection speed. So you can just simulate latency, and that's doing what you do: sleep(latency) between each packet sent. 5 second seems like a lot though.</p> <p>But if you think bandwidth might be relevant, it's actually quite simple to simulate: bandwidth is the max number of bytes per second that you can send, and latency is the duration it's going to take to get to its destination. </p> <p>How to do it: have a global timestamp "blockedUntil", representing the time until your connection becomes free again to send data. Initialise to 0 at the beginning of your program, as we assume it's not being used yet. Then, everytime you have a packet to send, If "_blockedUntil" is less than now(), set it to now(). Then calculate the time it would take to write to your fictitious "wire" by doing: packet.size() / bandwidth, that'll get you a time duration, add the latency, and add that to "blockedUntil".</p> <p>Now compute dt = blockedUntil - now(), add the packet to the queue, and add a timer firing in "dt", which will pop the first packet in the queue, and send it.</p> <p>There you go, you've simulated bandwidth and latency.</p> <p><strong>Edit:</strong> as someone mentioned there's the question of dropped packets too. You can simulate that by having a probability of dropping packets. <strong>Note:</strong> This is solely possible when one is manipulating packets from an unconnected protocol such as Ethernet or UDP. In the case of TCP for example, it won't work.</p>

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