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PySpec

PySpec is a Python implementation of the SPEC server and client protocol, providing tools for remote control, data acquisition, and automation in scientific instrumentation environments. It enables Python-based clients to interact with a SPEC server, control motors, read/write variables, and execute commands or functions remotely.

Features

Async client-server architecture for high-performance remote control
Remote property and function access (read/write variables, call functions)
Motor control and status monitoring
Associative array and data array support

Installation

PySpec requires Python 3.9+ and depends on cython, h5py, numpy, and pyee.

pip install chess-pyspec

# or for development
git clone https://github.com/Verdant-Evolution/chess-pyspec
cd chess-pyspec
pip install -e .[dev]

Quick Start

Connecting as a Client

import asyncio
from pyspec.client import Client

async def main():
    async with Client("127.0.0.1", 6510) as client:
        # Get a reference to "var/foo" on the server.
        foo = client.var("foo", int)
        await foo.set(42)
        value = await foo.get()
        print("foo:", value) # foo: 42

        result = await client.call("add", 2, 3)
        print("add(2, 3):", result)


        # Wait for properties to be set to specific values
        await foo.wait_for(15, timeout=10)


asyncio.run(main())

Motor Control Example

async with Client("127.0.0.1", 6510) as client:
    motor = client.motor("theta")

    # Read and write motor properties and parameters
    await motor.sign.get()
    await motor.offset.get()
    await motor.position.get()
    ...

    # Move motors on the server
    async with motor:
        await motor.move(10.0)
        pos = await motor.position.get()
        print("Motor position:", pos) # "Motor position: 10.0"

Output Streaming Example

async with Client("127.0.0.1", 6510) as client:
    async with client.output("tty").capture() as lines:
        await client.exec('print("Hello, world!")')
    print(lines[-1])  # Should print 'Hello, world!\n'

Starting a Server

from pyspec.server import Server, Property, remote_function
import asyncio

class MyServer(Server):
    foo = Property[int]("foo", 0)

    @remote_function
    def add(self, a: str, b: str):
        return float(a) + float(b)

async def main():
    async with MyServer(host="127.0.0.1", port=6510, test_mode=True) as server:
        await server.serve_forever()

asyncio.run(main())

Hardware servers currently support properties and remote function calls. Connect with a PySpec or spec client to interface with a PySpec server.

Currently unsupported server features:

Associative Arrays
Motor Protocols (through ../start_one or ../start_all )

Testing

Run the test suite with:

pytest

Documentation

See the docs/ directory for full API documentation and usage details.

License

See LICENSE or the source headers for license details. Portions copyright Certified Scientific Software.

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chess-pyspec 1.0.6

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PySpec

Features

Installation

Quick Start

Connecting as a Client

Motor Control Example

Output Streaming Example

Starting a Server

Testing

Documentation

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SHA256	`f3dbab9518e815a03d64b1e8f23a0b1b0b9dab5ccc2622df166e61abf72cadfc`
MD5	`9577329c12c87a86adfe321fdfd1a39c`
BLAKE2b-256	`d1b4263440835d4d117027b02578c02bde8d36433cbba7353547a6943cf96aac`

Algorithm	Hash digest
SHA256	`ec904e1e173a358ef643cc5ebc94a66ad7e2f7e0fcfbdafe22c089a45e6ed0cf`
MD5	`d1cd6b80ce2e47c86bfb356ea0b1f4c6`
BLAKE2b-256	`632df3f402b8c59afff3709f610c05ffe009af4d3f8895ba561afe8a8ba73485`

Algorithm	Hash digest
SHA256	`7f5371df3a60e66740f99de6a927ee7051ad3332b2545c85760f1663aaf0f4ac`
MD5	`90521036583ed7bfa3b42fa68ee1c3e5`
BLAKE2b-256	`4905e75b9ac761a1b92882b4ef98dec101b537d5e24b158d4487560059e4240b`

Algorithm	Hash digest
SHA256	`8106a96d71d1b613c098789def2514c9460ed90cdc0085a8a23ca103b9c98df5`
MD5	`6cc93a2ec750cca4afdb90113dc885e8`
BLAKE2b-256	`be582092a3f5ecebeb5ffc1d980a4cb1a60272f704fe9dce50c6c00c8c365900`