蓝牙(Bluetooth)，或称为蓝芽，是一种新式的无线传送协议，最初由爱立信创制，后来由蓝牙特别兴趣组订定技术标准。据说因为此技术尚在萌芽的阶段，故将Bluetooth以“蓝牙”的中文译名在台湾地区进行商业的注册，不过根据英文本身的意义直译，还是“蓝牙”较为贴切。
据供应链消息，目前Wi-Fi、交换器、以太网芯片报价均持续上涨，例如可以通用在终端PC、工业电脑及消费性电子产品的Wi-Fi模组，2020年报价在3.5美元左右的偏高水准，但第3季已被炒高到16-17美元，客户却完全不在意，一心想多要货。
A Bluetooth gateway is an electronic device that connects a Bluetooth product to other hardware. For instance, an audio or stereo BL gateway connects a Bluetooth-enabled device to an external speaker. In this article, our focus will be on a cellular BL gateway. Cellular BL gateways converge cellphone accounts with home landlines.
Today, we have an assortment of wireless protocols so that it might become a little confusing to check them all. On one hand, it is helping developers of wireless technology to address specific issues in design. On the other hand, it also makes identifying the right protocol a bit different task. It becomes particularly true when we have to choose between BLE (Bluetooth low-energy) and Bluetooth Classic. A person who is not a tech expert may assume BLE and Bluetooth as the same devices. However, it is crucial to know the differences, advantages, and disadvantages of all options to choose a perfect Classic or BLE gateway.