UDP port forwarding for android emulator; "adb forward udp:port udp:port" and telnet localhost adb_port not working

Question

Hi I am developing an app using android emulator. I need to register a UDP socket at some port X that can be accessible from local network. Since Android emulator is NAT'd so I need port forwarding. I followed this post "Reaching a network device by IP and port using the Android emulator". It shows that I need to use

adb forward tcp:localPort tcp:emulatorPort

but this scheme doesn't work for udp (If anyone knows its version for UDP then please let me know). For UDP I found another solution that I need to telnet to adb port as follows (My adb is running at port 5037)

telnet localhost 5037

and redirect UDP port using redir command

redir add udp:36963:36963

But when I telnet it gives the following error

telnet 127.0.0.1 5037

Connecting to 127.0.0.1:5037...
Connection established.
To escape to local shell, press 'Ctrl+Alt+]'.

Connection closed by foreign host.

I tried a lot to find any solution for this but fruitless.

I need to know any solution for accessing emulator from outer network.

Answer 1

The typical telnet port for the emulator is 5554.

Try:

telnet localhost 5554

Then you'll need to authenticate, the instructions are printed in the console. It should be something like copy the value from $HOME/.emulator_console_auth_token without the trailing '%'.

auth <auth_token>
redir add udp:36963:36963

Answer 2

This is wrong

redir add udp:36963:36963

Try this:

redir add udp:portA udp:portB

In the most of the cases portA and portB will be different. Adapt to your code