UDP 端口映射

On the host machine that runs the emulator, open a terminal window and
telnet to the emulator instance:

telnet localhost 5554


This will take you into the ADB emulator console. Then setup packet
forwarding on the port you are sending udp packets to:


redir add udp:<host machine port>:<emulator listen port>


example:


redir add udp:4444:4444


This will then have the emulator "listen" on your local machine's port
4444 for UDP packets, and forward those to the emulator's ETH adapter
on port 4444 (which can be changed to whatever you need).


I havent tried this with other external machines, but I struggled
getting this to work for a while. Also, any "servers" listening for
packets inside android (2.0) should be listening on IP 10.0.2.15
(android emulator's own Eth adapter), and in this case on port 4444.


In the case where you want to broadcast UDP packets out of the android
emulator to the local machine, you wont need to setup a port redir,
but you will want to send them out to IP address 10.0.2.2 as this is
the "loopback" address on the host computer, and you can send them
directly to the port it is listening on.