Sometimes you can find a good deal on used power supply from various vendors. In my case it was Cisco C3K-PWR-750WAC and RPS 2300. The problem is, that they don’t output any voltage until they are plugged into device. The question is, how to fool them into thinking they are plugged in.
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Chinese PoE extractor teardown
I needed to power some cameras using Power over Ethernet but they only supported 12V input, so I ordered some PoE extractors from ali. Here they are for your information.
Hacking Wowme U300Q Car Camera to Actually Work
I recently came across a Wowme U300Q car camera on an auction at aukro.cz . At first glance, it seemed like a promising piece of tech, but after trying to use it, I quickly realized there was a major flaw—it didn’t rotate recorded files and it was not just an issue with my piece, also reviews confirmed it as a global problem. For anyone familiar with dash cams, this is a critical issue because, without rotating files, the camera quickly runs out of storage and stops recording.
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Reverse engineering Tesla 2-bus protocol
In my flat they have installed these new digital door phones running on two wires manufactured by Tesla:
I wanted to be notified when someone rings when we are not at home so I decided to reverse engineer it.
Continue reading Reverse engineering Tesla 2-bus protocolMy wireguard cheatsheet
I always search for this so I will write it down here.
Client
cd /etc/wireguard wg genkey | tee privatekey | wg pubkey > publickey vi wg0.conf
[Interface] PrivateKey = Address = 10.9.0.X/24 [Peer] PublicKey = dg1cKCId81d6h5cWUQ61BMHksBbi0FdFnitjxDuOuno= Endpoint = vpn.danman.eu:51820 AllowedIPs = 10.9.0.0/24 PersistentKeepalive = 25
wg-quick up /etc/wireguard/wg0.conf systemctl enable wg-quick@wg0.service systemctl edit wg-quick@wg0.service
[Service] Restart=on-failure RestartSec=5s
Server
systemctl stop wg-quick@wg0.service vi /etc/wireguard/wg0 systemctl start wg-quick@wg0.service
Reload
wg syncconf wg0 <(wg-quick strip wg0)
Updating RNS315 maps for fun and profit
I have RNS315 radio/navigation/media system (I will call it unit) in my car. I bought it with maps from 2014 which are hugely outdated so I started to research how to update the maps.
DIY WSON-8 socket
As I am dealing with flashing SPI NANDs in WSON-8 package, I wanted to make my life easier by using a socket. You can buy one for about $6 on ali but I also wanted to try a different approach with pogo pins.
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Fixing broken TP-Link TL-MR100
TL;DR: the problem is usually in corrupted data in SPI NAND flash, you need to download the original config data and flash back working modem firmware.
I noticed there is quite a lot of offers with used not working 4G router TL-MR100 in aukro.cz . I bought one with hope I can easily fix and use it. But the fix turned out to be not that easy.
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miniPCI-e dual USB card extender
Recently, I was looking for an affordable LoRaWAN gateway with 3G/LTE connectivity. I like Mikrotik products because they are easy to use and have many features (e.g. Wireguard VPN 😎 ) . I found RBwAPR-2nD which has a miniPCI-e slot which can be fitted with R11e-LR8 LoRaWAN gateway module or a card for mobile network connectivity (e.g. R11e-4G). The problem is you cannot have both because there is only one slot. Or can you?
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Hellobox B1 satellite finder teardown
It is a very simple device for about $15. The main SoC is GX6605S. There is some limited info about this chip on C-SKY page and some technical docs at their tools repo. It communicates with a Bluetooth module TLSR8266 using UART. There is also 4MB SPI flash holding the whole bootloader called GxLoader, Linux kernel and filesystem with the main app. The last important chip is RDA5815M which handles the RF to I/Q conversion. In the future I plan to add an USB-to-Ethernet adapter and repurpose it as an cheap opensource SAT>IP server.
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