FelipeMdeO opened a new pull request, #19405:
URL: https://github.com/apache/nuttx/pull/19405
## Summary
This PR adds a `sim:dropbear` board configuration. Using this environment
speedup development.
**Depends on** apache/nuttx-apps#3631: `NETUTILS_DROPBEAR` currently
requires a hardware TRNG (`ARCH_HAVE_RNG` + `DEV_RANDOM`), which the
simulator cannot satisfy — without that change the option is silently
dropped at configure time. The logs below were produced with that PR
applied.
## Impact
- **Hardware**: simulator only.
- **Documentation**: new `dropbear` subsection in
`Documentation/platforms/sim/sim/boards/sim/index.rst`.
## Testing
Host: Ubuntu 24.04 (aarch64), GCC 13.3.0
Target: NuttX simulator, `sim:dropbear` (with apache/nuttx-apps#3631
applied):
```console
$ ./tools/configure.sh sim:dropbear
$ grep -E 'NETUTILS_DROPBEAR=|NSH_DROPBEAR=|NSH_LOGIN_PASSWD=' .config
CONFIG_NETUTILS_DROPBEAR=y
CONFIG_NSH_DROPBEAR=y
CONFIG_NSH_LOGIN_PASSWD=y
$ make -j4
```
Boot, with Dropbear started automatically by NSH and the preset address,
then create a user:
```console
$ sudo ./tools/simhostroute.sh eth0 on
$ ./nuttx
NuttShell (NSH) NuttX-12.6.0-RC1
nsh> [6] Jun 01 00:00:00 using NuttX passwd auth at /tmp/passwd
dropbear: listening on port 2222
nsh> useradd admin nuttx2026
```
Connect from the host into an interactive NSH session over SSH:
```console
$ ssh -p 2222 [email protected]
[email protected]'s password:
nsh> uname -a
NuttX 12.6.0-RC1 5ebe305b23 Jul 11 2026 18:43:50 sim sim
nsh> free
total used free maxused maxfree nused nfree name
67108864 2115832 64993032 2183104 64983816 138 5 Umem
nsh> exit
Connection to 10.0.1.2 closed.
```
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