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Seems like i found a working solution myself. this also works if you have the following setup: running roscore on a machine A connect ethernet cable and get ip adress via dhcp communicate from a machine B via network to roscore on machine A
the solution is to set up a network bridge on machine A which bridges to all other network devices (e.g usb0, eth0 ...). Assign a static IP to the bridge device and set ROS_MASTER_URI and ROS_IP to that ip. Start the roscore. When plugin the ethernet cable or tablet (...) just restart the bridge adapter using ifconfig down/up and all devices can communicate with the core using the bridge adapter's ip
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