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Besides the usual suspects (working DNS, using ROS_IP, ROS_MASTER_URI, etc), be sure there is real bi-directional communication possible between the involved hosts. Especially if your emulator is not running on the same host as your ROS master / other nodes.

See the Using Network Redirection subsection in the Emulator Networking section under Setting Up Virtual Devices in Using the Emulator on the Android Developer site.

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