Linux, FreeBSD, networking, etc.
Problem with mail relay Recently, I found in the Postfix logs on my personal mail server some suspicious temporary rejects, with error Client host rejected: cannot find your reverse hostname [212.132.99.84] The email was eventually delivered after several retries. The root cause needs investigation. The initial assumption was that Postfix was misconfigured. Reproduced the issue locally for further…
Recently, I purchased an NVMe drive and USB enclosure to do on-site backups of some large files from my Apple M3 Pro. The chipset is JMS-583. It gives around 1Gb/second transfer speed, which is not as good as new USB4/TB enclosures but fast enough for me. I wanted to see SMART data for the drive […]
About IONOS VPS IONOS provides cheap Linux VPS hosting with full root access and unlimited traffic. It also provides a KVM console to administer out-of-band if needed. The only problem is that it does not support FreeBSD; the only available options are Linux flavors. However, I found that installing and using FreeBSD 14 using the mfsBSD project is possible. Internally, IONOS uses the Microsoft…
One of my old home automation boards running ebusd is still using Raspberry PI 1 B SoC. FreeBSD is still perfectly supporting this hardware, however, due to being a Tier-2 platform, binary updates freebsd-update are not supported. Of course, one can download the new image, but this will mean re-installing and reconfiguring all the software, […]
This tool also exports battery current, so I wrote a small script to grab it from the SSH and export to the format that telegraf expects:
As I am (still) using a gas boiler I need to monitor gas leakage to ensure that if it happens I am aware before it caused any damage. In the past, I was using "dumb" sensors with only sound/led indication of the leak. Now, as it was time to replace the old sensor anyway, I decided to try something more intelligent. Some of the criteria I was using to find the device: It should be able to work…
Recently my energy counter was upgraded to ZPA ZE314. I found that reading data with IEC 62056-61 (OBIS) still works as expected, the only difference is that now I need to send not only '\x2F\x3F\x21\x0D\x0A' but also '\x06\x30\x30\x30\x0D\x0A' to start the transfer, so I will have to change my Domoticz integration. Below is the meaning of the attributes, from different sources: /ZPA5ZE314.v61_012…
Why to do that way I had an old and long-time unused DSL router TP-Link TD-W8970B v1 collecting dust on my shelf. And USB LTE dongle from Huawei, E3372H which I rarely used as a backup connection. As TP-Link also had 2 USB ports I decided to convert it from DSL to LTE using this dongle. Initially, I tried with stock firmware (the last update from 2014) and it was not working. It supports only old,…
After upgrading to Mac M1 I decided to run FreeBSD virtually. As VirtualBox is not supported on this host (and likely will never be) QEMU was the only possible choice. I found great gist post on how to do this with patched QEMU 6. The good news is that now QEMU 7 is released and it includes all proposed patches + some other related fixes. This note just updating the gist above for the latest QEMU…
Some time ago my DHT22 sensor, connected to the RPi1 , died (humidity always was showing 99%), so I decided to replace it. I found a cheap AM2320 sensor that was in the same case as my old DHT, so I ordered it. When it arrived I found that its used 4 PINS instead of 3 and I2C protocol instead of simple 1-Wire in DHT. So I had to spend some time learning how to get the data from it. Enabling I2C…
