I’ve recently deleted a large preview database file for Lightroom and was happy about the 80GB won free space. However, the MacOS disk utility as well as the terminal command “df -h” did not show the free space. I’ve also checked the trash and cleared it, but there was no change in the available disk space.
I’ve taken a closer look at the free space column in the disk utility and found a new variable behind the available disk space: GB purgeable.
I own a Xiaomi Robot Vacuum. This robot can be controlled by the Xiaomi app, however, I don’t like it very much. The idea is to control this robot over HomeKit. To use HomeKit, I use an old Raspberry Pi 1B. The software will be HomeBridge.
Use Etcher to write the image to the SD card. Remount that SD card and add a file called “ssh” in the root of the mounted partition. This will enable SSH from the beginning so that you can login directly to the Pi. I don’t want to attach a screen or keyboard to that machine so it will only be reachable over the network. Now boot your Pi from this SD card.
Identify the Pi’s IP (e.g. by looking at the network overview in your router). Now connect to that IP with user “pi”. The default password is “raspberry”. Please change the password now with passwd and assign a new user password.
According to Wojtek only this version works currently with HomeBridge. I did not test any other version so I’m just describing what I did on my machine:
Download nodejs for the PI into your users homefolder, e.g. with wget https://nodejs.org/dist/v8.9.4/node-v8.9.4-linux-armv6l.tar.xz
Unpack the file with tar -xvf node-v8.9.4-linux-armv6l.tar.xz
sudo cp -R * /usr/local/
add export PATH=$PATH:/usr/local/bin to e.g. ~/.bashrc
node should be now available
Install the necessary libraries: sudo apt-get install libavahi-compat-libdnssd-dev
Install HomeBridge with npm: sudo npm install -g --unsafe-perm homebridge
open /etc/default/homebridge and safe it with this content:
# Defaults / Configuration options for homebridge
# The following settings tells homebridge where to find the config.json file and where to persist the data (i.e. pairing and others)
# If you uncomment the following line, homebridge will log more
# You can display this via systemd's journalctl: journalctl -f -u homebridge
open /etc/systemd/system/homebridge.service and safe it with this content:
Generate a new MAC address separated by : using this website. You’ll need the IP address of your Xiaomi robot as well as the token. There are several ways to get the token. I’ve extracted mine from the iOS backup. Instead of uploading the token I’ve used this command on the token taken from the sqlite database:
Install the Home app, if you’ve removed it from your device. You can reinstall it from the App store.
Open the Home app and add a new device
If you’ve give the app access to your camera, you can scan the QR code you’ve seen earlier. However, HomeBridge is now running as a daemon in the background so you won’t see that QR code. You can add the bridge manually by using the PIN you’ve set in the config.
I’m using a 802.11ac WLAN to connect to my Synology NAS. With the last Mac OS 10.12.2 update the network performance was catastrophic when I tried to access the NAS via SMB. At first I thought this might have been caused by the WLAN connection but even with a Gigabit LAN connection my transfer rates were around 3-5MB/s.
Apple uses their own version of SMB and enabled client signing to mitigate against Man in the middel attacks. Therefore all connections underly this signing process and are way slower.
Therefore I’ve disabled client-signing on my mac using this command:
printf "[default]\nsigning_required=no\n" | sudo tee /etc/nsmb.conf >/dev/null
This will write this content
to the file /etc/nsmb.conf. After you’ve set this value you need to unmount all samba shares. If you’ll reconnect now, you’ll witness a much better performance, starting with faster loading of network shares.
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