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Since ROS message exchange is based on TCP-sockets, it shouldn't be a problem mixing 32- and 64-bit computers. We are using two 64-bit clients with a 32-bit roscore ourselves, because we need a 32-bit only CANBus driver on our robot.

But you should consider, that depending on your sensor, the network connection can become a bottleneck. So if your sensor requires some heavy bandwidth you may be forced to go the painful way and port one of your components.