Tag Archives: linux

BalenaFin – compute module motherboard

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The BalenaFin board, made by balena.io is a compact Raspberry Pi compute module 3 mother board.

This kind of setup is really useful when making industrial embedded systems in small to average volume like I did and described in a previous post presenting my solution on waveshare system.

I thank you Balena.io, especially Marc, for giving me the opportunity to test this product. So you understand I did not payed to get that one, but as usual, I’m totally free about what I’m writing about it.

The BalenaFin costs $129 w/o taxes and can be ordered on the balena shop. So, let’s how to use it and get benefit of the balena.io platform.

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Secure your children Internet access

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I’m a big fan of PiHole for my children but also for my IoT devices [not the one I build but the one I’m purchasing 🙂 ]. That said, there are two things missing in it:

  • The first one is that Pi-Hole is operating on DNS request so any malicious solution using its own DNS or direct IP will bypass Pi-Hole protection.
  • The second one is the lake of functionalities like stopping Internet for a certain group of user during certain period of time.

So, when a friend of me contacted me to share its work on a different solution using a proxy, I’ve been happy to let him make a blog post here to introduce his solution. And this solution can be used in complement of PiHole. So, let’s make some place here to Manu PILLANT

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Transfer UDP over SSH

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When you want to transfer some UDP protocol from a remote server not directly accessible from your local host you can use a combination of SSH and socat to make this communication possible.

The application case is, as an exemple, a SNMP communication with a server in a DMZ to get metrics in a local area dashboard. Like in this exemple.

You have an intermediate host where SSH is accessible you can use as a gateway.

1- on the local host (on the left side), create a SSH tunnel with a TCP port forwarding (here 10000).

ssh -L 10000:localhost:10000 **gateway_host_ip**

2- on the gateway host, route the traffic received from the port we have previously associated to the UDP target host:port

socat tcp4-listen:10000,reuseaddr,fork UDP:**target_host_ip**:**udp_port**

3 – on the local host, route the traffic received from the given UDP port to the previously associated TCP port for tunnelling

socat -T15 udp4-recvfrom:**udp_port**,reuseaddr,fork tcp:localhost:10000

That’s it.

Pi Day – Sigma Lambda Pi

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Sigma Lambda Pi is the perfect thing to talk about on the 3/14 Pi day!

This crazy machine is a 16 Raspberry Pi-4 cluster in a 2U server rack, set to execute FaaS (Function as a Service) with a green-it approach. Don’t make a dream of Raspberry-Pi high performance demonstration, you will be disappointed and it’s not the purpose of this project. This is not a commercial product, the objective of the company who made it, was research, team building and team skills improvement. This has been made by friends of my, working at Be|ys, a team of 9 people, under the lead of Christophe Prugnaud. They made a demo of it during the Clermont’Tech Api Hour #46, the video will be soon accessible.

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Fongwah S9 NFC Reader

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I’m actually working on a device using a NFC chip from ST. Unfortunately, this chip is not using the ISO-14443 norms but the less usual ISO-15693 one. As a consequence the NFC reader I had were not compatible with this norms. I found a solution (there are not a lot) in Amazon to covert this need. The Fongwah S9 NFC Reader. I made this post to share my test experience of this device.

Precision: this is not a post made for Fongwah, I really have to crash my head on this device and the purpose of this post is to save your time. The fondwah S9 is a nice tool with a multi-language (on top of C library) SDK but it is delivered with no easy documentations, broken links and no reference on ISO-15693 support… I was a bit disappointed once the box opened.

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Centos7 – Manage LVM & extend LVM

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This is a recurrent operation I’m doing regularly these time : extending a Linux partition by adding new virtual disk I’ve attached to a growing VM. Nothing fantastic to expect in this post. Its purpose is to keep on my hand the solution I’ve used to stop searching google and getting a different one every time ;).

This tuto is applicable for centos 7. The content will be updated when I’ll have to perform different operations.

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