Under Ubuntu, there are some software that can convert serial port data into Bluetooth signals and send them out. Here are some commonly used software:
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BlueZ: BlueZ is a Bluetooth protocol stack that can be used under Ubuntu. Through BlueZ, data can be transmitted using the RFCOMM channel of the serial port protocol.
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RFCOMM: RFCOMM is a Bluetooth protocol that can establish serial port communication between Bluetooth devices. Ubuntu has installed RFCOMM by default, which can be configured through the rfcomm command.
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PyBluez: PyBluez is a Python Bluetooth library, which can use Python to write programs to control Bluetooth devices. Using PyBluez, serial communication can be done via RFCOMM protocol.
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Node.js: Node.js is a JavaScript runtime environment based on the Chrome V8 engine, and you can use JavaScript to write programs to control Bluetooth devices. Using Node.js, you can use the SerialPort module of Node.js to control the serial port and send data via Bluetooth.
These software can be found and installed in the Ubuntu software repository.