Linux Tips

 Since I'm engaged in VoIP-related job, I often do things other than SIP (Session Initiation Protocol) devices. In some cases, Android or IOS-based SIP terminal apps are made, and in some cases, hardware phones sold in the market are tested. Sometimes I have inquiries regarding the production of special purpose SIP devices. One of the recent proposals was to develop a telephone for the elderly living alone or in the home of a woman living alone. This phone is not a phone that usually makes a call by pressing a phone button, but requires a function that detects an emergency situation and automatically makes a call when an emergency situation occurred. When the embedded voice recognition device recognizes an urgent sentence, it transmits a signal to the phone, and the phone automatically calls the rescue center to connect with the rescuer. <System configuration requested> The requested phone has the following features. There is no need to connect with a typi...

 Recently I installed MySQL on Ubuntu 20.04 LTS and tested. Initially, it planned to install MariaDB. There was no problem with DB installation and remote access, but there was a problem with ODBC setup. After a long time of googling, I discovered that there was a problem setting up MariaDB ODBC in Ubuntu 20.04. It will probably be resolved after some time, but I decided to reinstall MySQL instead of MariaDB because we need to proceed with the test urgently. I installed Ubuntu using ubutu-20.04.1-live-server-amd64.iso image that does not support GUI, and I will omit the information about Ubuntu 20.04 installation. Delete Previous Version If you want to erase MariaDB and rephrase MySQL like me, you should delete it cleanly. The "apt remove" command is not a good method because it leaves a set value. It is recommended that you completely delete the set value with the "apt purge" command. Install MySQL Installing MySQL is very simple. Install MySQL Server and client to...