Need Help with network connection

Hi i wrote a program that communicates hardware devices that communicate through network, now i have a problem that is bugging me, i have three hardwares, one at IP of 192.168.2.100, one at IP of 192.168.5.12 and one at 192.168.1.99. How can i establish connection with all the hardware with one computer which is suppose to only have 1 IP gateway, when i set my gateway to 192.168.1.1 i can only connect with 192.168.1.99 etc. Can anyone help me on this? Much thanks:confused:

This isn't a problem with your program but rather a problem with the network. You have more than 1 network. You need a router that has the routes to these other networks so your program can communicate with them. Otherwise you'll have the problem that you are experiencing.