seriald is a high performance deamon which manages a serial port as well as provides the OpenWrt ubus interface for IPC. The binary size is only 21 kB.

seriald /dev/ttyS0

Can run multiple daemons on different device nodes.

See

seriald -h

Command:

ubus listen serial.ttyS0

Result:

{ "serial.ttyS0": {"data":"<incoming message>"} }

<incoming message> is a line read from the serial port. All the CR (\r) and LF (\n) characters will be eliminated from it.

ubus call serial.ttyS0 send '{"data": "<outgoing message>"}'

data is a fixed attribute. To send a message to the serial port, replace <outgoing message> with the message you want to send. An <outgoing message> will be appended an LF (\n) character at the end before seriald passes it to the serial port.

Except where otherwise noted, all parts of this software is licensed under GPLv3. This work is based on picocom, which is licensed under GPLv2.