Recalbox's Netplay online list have very little users online, not more than 10, sometimes up to 15 games and that's all.
I wonder why? Considering Recalbox is very well-known system all around the world, has thousands of users in all the continents.. I think manual/static IP, port forwarding and so on, seem hard for users to achieve.. Anyway, I wrote u step-by-step guide on how to set a static IP, I hope it'll be useful:

For everyone who needs static IP address (for Port Forwarding/Netplay):

Recalbox should be on and connected to the same modem/network as your PC. Tested on Windows 10:
Go to Command Prompt (On Keyboard press Win Key+R, type: cmd and enter)
Type the following commands:

ping recalbox
(You'll get your recalbox's IP address) In this case, 192.168.1.16 as example:

then type:

ssh root@192.168.1.16 (enter)
Answer 'yes' to all the questions, it will ask for your recalbox's root password, type recalboxroot as password.

Type:
connmanctl services and note what is returned, for example:
*AO Wired ethernet_b827eb6462be_cable

Then type:
cd (enter)
and then type:
nano custom.sh (enter)

Type the following text in nano editor:

#!/bin/bash
/usr/bin/connmanctl config ethernet_b827eb6462be_cable --ipv4 manual 192.168.1.16 255.255.255.0 192.168.1.1
mount -o remount,rw /
echo "nameserver 208.67.222.222" >> /etc/resolv.conf
echo "nameserver 208.67.220.220" >> /etc/resolv.conf

Please note that in our example custom.sh file:
192.168.1.16: Your recalbox's IP address that'll be static.
255.255.255.0: Your Subnet Mask
192.168.1.1: Your modem/router IP address.

Replace ethernet_*** by the value you've got previously and the IP address you want to give. You might wish to replace the DNS server IPs of the OpenDNS project, with the DNS servers (if any) provided by your own ISP.

Then quit from nano text editor by Ctrl X, answer the saving question by typing Y and then finally Enter.

After quiting nano and back to terminal shell, type the command:
chmod +x custom.sh
to make it executable, then:
reboot
to restart your Recalbox.

Finally, go to your modem/router Port Forwarding page, forward the port numbered 55435 (both TCP/UDP) to your Recalbox's IP address.
Let me know in case if you have any problem. Successfully tested on Recalbox 6.0.

For everyone who needs static IP address (for Port Forwarding/Netplay):
Recalbox should be on and connected to the same modem/network as your PC. Tested on Windows 10:
Go to Command Prompt (On Keyboard press Win Key+R, type: cmd and enter)
Type the following commands:

ping recalbox
(You'll get your recalbox's IP address) In this case, 192.168.1.16 as example:

then type:

ssh root@192.168.1.16 (enter)
Answer 'yes' to all the questions, it will ask for your recalbox's root password, type recalboxroot as password.

Type:
connmanctl services and note what is returned, for example:
*AO Wired ethernet_b827eb6462be_cable

Then type:
cd (enter)
and then type:
nano custom.sh (enter)

Type the following text in nano editor:

#!/bin/bash
/usr/bin/connmanctl config ethernet_b827eb6462be_cable --ipv4 manual 192.168.1.16 255.255.255.0 192.168.1.1
mount -o remount,rw /
echo "nameserver 208.67.222.222" >> /etc/resolv.conf
echo "nameserver 208.67.220.220" >> /etc/resolv.conf

Please note that in our example custom.sh file:
192.168.1.16: Your recalbox's IP address that'll be static.
255.255.255.0: Your Subnet Mask
192.168.1.1: Your modem/router IP address.

Replace ethernet_*** by the value you've got previously and the IP address you want to give. You might wish to replace the DNS server IPs of the OpenDNS project, with the DNS servers (if any) provided by your own ISP.

Then quit from nano text editor by Ctrl X, answer the saving question by typing Y and then finally Enter.

After quiting nano and back to terminal shell, type the command:
chmod +x custom.sh
to make it executable, then:
reboot
to restart your Recalbox.

Finally, go to your modem/router Port Forwarding page, forward the port numbered 55435 (both TCP/UDP) to your Recalbox's IP address.

Successfully tested on Recalbox 6.0.
Let me know in case if you have any problem.

Greetings Recalbox team!

Just a suggestion (I think you'll face with many questions related to that), could you please integrate support for PS5 DualSense controller with Bluetooth connection, without using any USB dongle?

Just like how Recalbox does with PS4 and PS3 controllers..

As far as I know, RetroPie supports it via Bluetooth. Perhaps, it'll be possible for us, Recalbox lovers?

Reference: https://www.youtube.com/watch?v=4RjnQi-2fjs

Best regards.

While Raspberry Pi 4 having a huge GPU boost (Broadcom VideoCore VI), it will easily (and almost perfectly) emulate PS1, Dreamcast, N64, and even perhaps PS2.

Hello.

PS5 DualSense controller is very laggy and instable on a RPi4 with Recalbox 9.2.

It was working fine on Recalbox 9.1, before updating to this version.

Hello @akkeoss Great news! Thanks so much for all your efforts!

@zing So it seems they added it for 64-bit as well?

https://github.com/libretro/pcsx_rearmed/issues/690#issuecomment-1250162287

Any alternative emulator having the same feature (enhanced resolution) for RPi4?

@zing I changed (actually not changed but I set the same buttons), now they work. But it obviously seems these settings are corrupted. Just a note for you guys here.

The main problem is, why it stopped working after 8.1 update.

@zing That was a horrible news.

@zing

Have you tried remapping your controller in the Recalbox controller settings menu? : Yes.

Are R/L working in games? : Yes.

Have you tried changing the shortcuts in the Retroarch menu (accessible with Hotkey+B)? : No. They are default keys.

Any idea?

Hi there.

I used to replace shaders on-the-fly during a game by Hotkey+R/L buttons.

However after updating to 8.1, it seems this is gone now. When I try the same key combo, it doesn't change at all.

Is this a bug, or were the shortcut keys changed in 8.1?

Any by the way, Screenshot doesn't appear in main menu as a "System" anymore. When I take screenshots, they don't appear nowhere within any menu.

Hi.

I've just updated to 8.1 version, a great work, thank you all who contributed it!

Question:
Is "Enhanced Resolution" mode removed from Pcsx-Rearmed?

It seems I cannot find it around the options in RetroArch. (Using RPi4)

But I'm sure, that option was there before the update 8.1.

Hi.

Any way to set Recalbox in completely read-only mode? I'm sick and tired of fixing my lil cousins' Recalbox, almost each week. Those kids are Recalbox killer!

I'd love to "freeze" all settings and roms and so on, after I set it up and before bringing it to them, again.

How to set entire Recalbox system in read-only mode?
Want to achieve;

-No rom deletion.
-No configuration change.
-No access to system menu.