#Bluetooth
Labels Printing Off-Center? Calibrate the Print Offset Once
After getting the label printer to fire its printhead, the next problem was that the text missed the sticker. I stopped guessing and printed rulers and corner markers to measure it, then clearly separated paper size, printable area, and offset into three distinct values.
Decoding a Bluetooth Label Printer Protocol from btsnoop
My Bluetooth label printer only had a mobile app and no way to connect it to my own system, so I enabled HCI snoop logging on my own phone, peeled away HCI/ACL/L2CAP/RFCOMM one layer at a time with a short Python parser, and compared the results with open-source libraries until I could read the commands and print directly from a script.
Read a Toledo RS-232 Scale over Bluetooth with PowerShell
Connect a TWT-01 digital scale with only an RS-232 port to a PC through a BT578 Bluetooth adapter, then read its weight in real time with PowerShell — from Bluetooth pairing and finding the COM port by MAC address to decoding 18-byte Toledo Continuous frames and the null-byte and scale auto-sleep pitfalls I encountered in practice.