examples/nxscope: control stream interval from CLI

[raiden00pl]

Summary

add the ability to control the nxscope example stream interval from the CLI which is useful for performance testing

Impact

a new function useful

Testing

tested on qemu-intel64:

NuttShell (NSH) NuttX-12.12.0
nsh> nxscope -h
ERROR: unsupported argument
Usage: nxscope [-i <stream_interval_us>]
          [-m <main_interval_us>]
nsh> nxscope -i 10 -m 100
stream interval = 10
main interval = 100
nxscope_samples_thr
nxscope_charlog_thr
nxscope_crichan_thr

[acassis]

@raiden00pl please update the nxscope App documentation: https://nuttx.apache.org/docs/latest/applications/examples/nxscope/index.html

[cederom]

Thank you @raiden00pl :-)

• Nice useful functionality.
• -h could be valid cmd arg.
• doc needs update as @acassis noticed :-)
  • interval support.
  • udp transport.