jumpstarter-driver-pyserial 0.7.4

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PySerial driver

jumpstarter-driver-pyserial provides functionality for serial port communication.

Installation

:substitutions:
$ pip3 install --extra-index-url {{index_url}} jumpstarter-driver-pyserial

Configuration

Example configuration:

export:
  serial:
    type: jumpstarter_driver_pyserial.driver.PySerial
    config:
      url: "/dev/ttyUSB0"
      baudrate: 115200
      cps: 10  # Optional: throttle to 10 characters per second

Config parameters

Parameter	Description	Type	Required	Default
url	The serial port to connect to, in pyserial format	str	yes
baudrate	The baudrate to use for the serial connection	int	no	115200
check_present	Check if the serial port exists during exporter initialization, disable if you are connecting to a dynamically created port (i.e. USB from your DUT)	bool	no	True
cps	Characters per second throttling limit. When set, data transmission will be throttled to simulate slow typing. Useful for devices that can't handle fast input	float	no	None

CLI Commands

The pyserial driver provides two CLI commands for interacting with serial ports:

start_console

Start an interactive serial console with direct terminal access.

j serial start-console

Exit the console by pressing CTRL+B three times.

pipe

Pipe serial port data to stdout or a file. Automatically detects if stdin is piped and enables bidirectional mode.

When stdin is used, commands are sent until EOF, then continues monitoring serial output until Ctrl+C.

# Log serial output to stdout
j serial pipe

# Log serial output to a file
j serial pipe -o serial.log

# Send command to serial, then continue monitoring output
echo "hello" | j serial pipe

# Send commands from file, then continue monitoring output
cat commands.txt | j serial pipe -o serial.log

# Force bidirectional mode (interactive)
j serial pipe -i

# Append to log file instead of overwriting
j serial pipe -o serial.log -a

# Disable stdin input even when piped
cat data.txt | j serial pipe --no-input

Options

• -o, --output FILE: Write serial output to a file instead of stdout
• -i, --input: Force enable stdin to serial port (auto-detected if piped)
• --no-input: Disable stdin to serial port, even if stdin is piped
• -a, --append: Append to output file instead of overwriting

Exit with Ctrl+C.

API Reference

.. autoclass:: jumpstarter_driver_pyserial.client.PySerialClient()
    :members: pexpect, open, stream, open_stream, close

Examples

Using expect with a context manager

with pyserialclient.pexpect() as session:
    session.sendline("Hello, world!")
    session.expect("Hello, world!")

Using expect without a context manager

session = pyserialclient.open()
session.sendline("Hello, world!")
session.expect("Hello, world!")
pyserialclient.close()

Using a simple BlockingStream with a context manager

with pyserialclient.stream() as stream:
    stream.send(b"Hello, world!")
    data = stream.receive()

Using a simple BlockingStream without a context manager

stream = pyserialclient.open_stream()
stream.send(b"Hello, world!")
data = stream.receive()

from jumpstarter_driver_pyserial.driver import PySerial
from jumpstarter.common.utils import serve

instance = serve(PySerial(url="loop://"))

pyserialclient = instance.__enter__()

instance.__exit__(None, None, None)