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. Update: including N2200-PAC-400W Continue reading Repurposing Cisco power supplies
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. Black one White waterproof one Conclusion They both only support 100Mbps over 2 pairs. The wateproofing was quite annoying to remove but not impossible. It Continue reading Chinese PoE extractor teardown
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 Continue reading Hacking Wowme U300Q Car Camera to Actually Work
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. During idle, there is a voltage of about 23V which is there to power the phones Continue reading Reverse engineering Tesla 2-bus protocol
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…
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 I bought it with maps from 2014 which are hugely outdated so I started to research how to update the maps. The obvious way is to go to the dealer and buy map update but that costs some higher tens of Euros Continue reading Updating RNS315 maps for fun and profit
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. So I designed some PCBs. They came today: You can see there Continue reading DIY WSON-8 socket
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 Continue reading Fixing broken TP-Link TL-MR100
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 Continue reading miniPCI-e dual USB card extender
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 Continue reading Hellobox B1 satellite finder teardown