[Samba] nmbd don't start but gives no error (termux)

[f0rhum]

Hi Samba Members
This is my first post here.
In my digital camera pictures workflow I used to have samba. I'll be 
glad to explain why if anybody asks.
Now the workflow is broken at the level of the samba link.
The required setup is a single client and a single standalone server 
(the issue is in the server, if ever can be fixed without completely 
replacing the client hardware, which... I'd rather like not ;-) ).
The client is a digital camera (panasonic TZ70) with smb support. 
According to the documentation of the camera, a Windows PC with Win7 to 
8.1 (which translates to smb2_10 to smb3_02 IIUC) is supported for 
featured proprietary camera/PC transfer applications... that are now no 
more available... and I never used, as a Linux user.
The server was an old Android App (SambaFilesharing-dev-130413.apk) 
whose development is frozen for years and is incompatible with recent 
hardware OS. Now the server would be the naked samba server running over 
termux emulator in Android15... or any paid app.
What happened: I upgraded the server hardware, so the OS: Android5 to 
12/13/14 then A15 at the moment => server broken.

I hope I can get help from the list:
The (firmware up to date) client is poorly features, so I'm using my 
linux laptop to setup/test a working server in the phone, with no other 
helper app in the phone, by taking into account the requirements I'll 
later have with the real camera (for tests purpose I disabled the 
firewall in the laptop).
At the moment I reached to connect to the server using its LAN IP address:

smbclient //192.168.1.5/tz70 -p4445 -U=redacteduser%redactedpw -d2 
--debug-stdout
rlimit_max: increasing rlimit_max (1024) to minimum Windows limit (16384)
added interface wlan0 ip=redacted-not-useful-IPv6
added interface wlan0 ip=redacted-not-useful-IPv6
added interface wlan0 ip=192.168.1.29 bcast=192.168.1.255 
netmask=255.255.255.0
Cannot do GSE to an IP address
Try "help" to get a list of possible commands.
smb: \>

All fine, but maybe the GSE line. This also works with port 1139 *
This will be enough when I'm at home, but won't work outside home where 
I must use the phone hotspot to bind the server to.
And I can't connect using the netbios name set in smb.conf:
me at laptop:~$ sudo smbclient //REDACTED-NAME-SHORTER-THAN-15/tz70 -p4445 
-U=redacteduser%redactedpw -d2 --debug-stdout
...
do_connect: Connection to REDACTED failed (Error NT_STATUS_NOT_FOUND)

whether I use port [1]139/[1]138/[1]139/[4]445

The problem is I have to connect with the name because the server ip 
will always change (new borring feature of Android hotspot since some 
release between A5 and A12)

*the serveur runs as non root, so it can't bind to low ports and then 
the default config in smb.conf is smb ports = 1139 4445
to which I added without benefit
nbt port = 1137
dgram port = 1138

and in the phone I added 8 iptables -t nat PREROUTING rules to redirect 
tcp/udp the -d 4 low ports --to-destination 4 high ports


There I am stuck
smbtree says nothing but smbc_opendir: no such file or directory
nbtscan finds nothing
and
ps -ax|grep mbd on server side only shows 3 smbd instances but none nmbd 
even a nmbd.pid file is updated in server's /var/run/samba/ on each time 
I run the command
nmbd -D -p1137 -d3
and the log won't show error

Please any clue ? I posted logs 2+ months ago with no answer since these 
days in https://github.com/termux/termux-packages/issues/22933

Thank you