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test as client

1) configurtion set like this in Application > Examples

[*] Network test example
[ ]   Loopback test
[ ]   Target is server 
[ ]   Test for Performance
[ ]   Initialize network
(0xabcd1234) Client IP Address

where set 0xabcd1234 to, where server program is running, your build machine.

2) run host program

In nuttx/apps/examples/nettest folder you'll find host program.

Just execute it.

3) run nettest as client After flashing NuttX, you can run nettest from nsh.

test as server

1) configuration set like this in Application > Examples

[*] Network test example
[ ]   Loopback test
[*]   Target is server 
[ ]   Test for Performance
[ ]   Initialize network
(0xabcd1234) Client IP Address

where set 0xabcd1234 to, where server program is running, your nuttx device IP.

2) run nettest as server After flashing NuttX, you can run nettest from nsh.

3) run host program In nuttx/apps/examples/nettest folder you'll find host program

Just execute it. host program will run as client and try to connect to the server running in the board.

etc

If you have multiple device you should set routing table.

What I've done is this in nsh.

addroute 127.0.0.0 255.0.0.0 127.0.0.1
addroute 0.0.0.0 0.0.0.0 192.168.1.10

where 192.168.1.10 is IP address of NuttX board.

Not sure this is correct. need to check the source code.