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Toybox 0.8.4-android multicall binary:  (see toybox --help) 
usage:  netcat [-46ELUlt] [-u] [-wpq #] [-s addr] {IPADDR PORTNUM|-f FILENAME|COMMAND...}


Forward stdin/stdout to a file or network connection.
-4   Force IPv4
-6   Force IPv6
-E   Forward stderr
-L   Listen and background each incoming connection (server mode)
-U   Use a UNIX domain socket
-W   SECONDS timeout for more data on an idle connection
-f   Use FILENAME (ala /dev/ttyS0) instead of network
-l   Listen for one incoming connection, then exit
-p   Local port number
-q   Quit SECONDS after EOF on stdin, even if stdout hasn't closed yet
-s   Local source address
-t   Allocate tty
-u   Use UDP
-w   SECONDS timeout to establish connection

Use "stty 115200 -F /dev/ttyS0 && stty raw -echo -ctlecho" with
netcat -f to connect to a serial port.

When listening the COMMAND line is executed as a child process to handle
an incoming connection. With no COMMAND -l forwards the connection
to stdin/stdout. If no -p specified, -l prints the port it bound to and
backgrounds itself (returning immediately).

For a quick-and-dirty server, try something like:
netcat -s 127.0.0.1 -p 1234 -tL sh -l

[ ToyBox ]    

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