seriallll 0.1.2

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seriallll

A small, modest Python helper for talking to serial ports. Works elsewhere via pyserial.

• Connect with optional retries (including “retry forever”)
• Auto-reconnect on I/O errors (e.g., cable unplug/replug)
• Simple, thread-safe read/write helpers
• Tiny API, single dependency

Installation

pip install seriallll
# or
uv add seriallll 

Quick start

from seriallll import SerialClient

client = SerialClient(
    port=None,           # None for auto-discover a macOS USB serial port
    baudrate=115200,
    max_retries=-1,      # retry forever on initial connect
    auto_reconnect=True, # reconnect on I/O errors
)

client.connect()
client.write_line("hello")
print(client.readline(timeout=1.0))
client.close()

Reading lines

line = client.readline(timeout=2.0)  # returns b"...\\n" or b"" on timeout

Raw read / write

client.write(b"\x01\x02\x03")
chunk = client.read(64, timeout=0.2)

Callbacks (optional)

def on_reconnect(c):
    print("Reconnected to", c.port)

client = SerialClient(port=None, on_reconnect=on_reconnect)

macOS notes

• Auto-discovery looks for /dev/tty.usb* (and falls back to /dev/tty.*).
• DTR (data terminal ready pin) is asserted on (re)connect, which some boards expect on macOS.

API surface

• SerialClient.connect() / close()
• SerialClient.write(data) / write_line(line, newline=b"\n")
• SerialClient.read(size=1, timeout=None)
• SerialClient.read_until(terminator=b"\n", timeout=None, max_bytes=None)
• SerialClient.readline(timeout=None, max_bytes=None)
• Properties: port, is_open

Troubleshooting

• No port found: pass --port explicitly (check ls /dev/tty.* on macOS).
• Time out reading: increase timeout or use read_until/readline.
• Flaky cable/adapter: keep auto_reconnect=True.

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