RaspberryPI | Remote service example

I want to install the JDK 16 on a RPi 3B and I downloaded the Linux ARM 64 Compressed Archive from the Oracle site. Every time I run the command to check the version of java I get the same error: bash: ./java: cannot execute binary file: Exec format error

I already tried to untar it again and download the archive from zero, but I get the same error every time. Considering the RPi 3B not able to support the JDK16 for some reason, I downloaded and installed the Kit on a RPi 4 too, but the result is always the same. I used the checksum to make sure the downloaded archive was intact and it was.

Am I downloading the wrong package or have I missed anything important?

I'm trying a very simple exmaple to create a shared library and link to it. The shared library is as follows:

I'm trying to set up my environment to use Yocto's generated SDK to compile my out-of-tree module, but for some reason, I'm getting an error.

cp: cannot stat 'arch/arm/kernel/module.lds': No such file or directory

I'm using Poky distribution and meta-raspberrypi which is needed because I'm using the RPI ZeroW board. Apart from this everything works fine. I'm able to compile the entire image and load it on the board.

Here is the line I've added to local.conf

TOOLCHAIN_TARGET_TASK_append = " kernel-devsrc"

as I've found in the documentation.

Also below you can find the whole log from the compilation.

i want to add .h and .lib files to a own created recipe to the sdk. I use cmake to build my lib's, with the sdk i can build it. My recipe name is served. (i want to add the served https://github.com/meltwater/served as a own recipe). in my served_0.1.bb File i add following:

I'am quite new to python and I am developing a passport scanner with a RaspberryPi and the passport eye module. In the end it prints outs the outcome of the scanned image. However, I also want to print an outcome if the scanner isn't able tot detect a MRZ code.

I tried some things but couldn't figure it out, here is a example in short:

I'm trying to transfer image data from a camera to the raspberry pi over SPI using the spidev interface. The maximum buffer size possible is 4096, I need about 200,000. This suggested:

I run a working Wireguard server with 2 Wireguard Gateways for Site-to-Site VPN and a couple of Mobile Devices with a Full Tunnel that are used occasionally. One of my Site Gateways is a RaspberryPi4 that I want to provide a WIFI-Access-Point that directly tunnels to the Wireguard Server. This RaspberryPi has working access to all connected subnets via the main Server, so Wireguard is setup properly.

I want to use my Raspi4 to roam the world and provide me a WIFI-Access-Point while any device that connects to it is directly routed into Wireguard and emerges to the web only from there. I used the standard gateway setup provided and my WIFI device can access the web but doesn't tunnel through Wireguard (yet).

I can't really find where I can configure where the access point is bound to, dnsmasq, apdconf or a simply iptables rule?

Example IPs

Server: 10.0.7.1, local network 192.168.0.1/24

Raspi4: 10.0.7.5, local network 192.168.6.5/24, WIFI 192.168.7.5/24

So far I haven't succeeded, ideas?

I know that this might not be the best place to ask questions I wanted to ask but frankly even though I've browsed through a lot of resources I haven't found satisfying answers. I've been trying to learn how to use Yocto and therefore I've got some questions. (Btw if you know a better place to ask them please just let me know in a comment so I could the question there and remove this one, in order to not mess too much).

• In Embedded-Linux-Development-Using-Yocto-Project-Cookbook I've found that the good practice is to create my own bsp layer. Is it true in the case when my new-custom-bsp layer would be depending on e.g. meta-raspberrypi? So the meta-raspberrypi would be like a base for my bsp layer?

• Why should I define my own images?

• What should be placed in bsp layer? Linux kernel version? Uboot configuration? Device tree? What if I have my own kernel modules? Should I put them in bsp layer? What if I have modules that handle not the hardware on the board itself but rather hardware that can be plugged in the board? Wouldn't be better to put them into my-custom-distro layer?

• As for my my-custom-distro - what should be placed in this kind of layer? Running services? Loading drivers? User configuration?

I got error when creating deployment. This is my Dockerfile that i have run and test it on local, i also push it to DockerHub