You can send and receive data from serial devices in Linux using command-line utilities like Screen or Minicom, or by redirecting the echo command. Before establishing a connection, you must identify the correct serial port path, which is typically found at /dev/ttyUSB0 for USB. A serial port is a hardware interface that allows data to be transmitted and received one bit at a time. In Linux, serial ports are typically represented as device files in the /dev directory, such as /dev/ttyS0, /dev/ttyUSB0, etc. These device files act as the interface between the operating. PuTTY is a free and open source gui X based terminal emulator client for the SSH, Telnet, rlogin, and raw TCP computing protocols and as a serial console client. This is usually done via the bootloader; we'll be using GRUB in our examples. With this profile enabled, you can connect to a Bluetooth module through a serial terminal.
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