PVAccess for Python (P4P)

P4P is a wrapper around the PVAccess (aka. PVA) protocol network client and server. P4P is part of the EPICS (Experimental Physics and Industrial Control System) ecosystem for creating large (and small) scale distributed process control and data acqisition sytems. https://epics.anl.gov/

P4P includes API for a Client API and Server API, as well as a PVA Gateway executable (pvagw) which can optionally enforce an access control policy.

Supports Linux, OSX, and Windows. With python 2.7 and >=3.5 (>=3.6 for asyncio support).

The recommended starting point is to install from pypi.org.

python -m virtualenv p4ptest
. p4ptest/bin/activate
python -m pip install -U pip
python -m pip install p4p nose2
python -m nose2 p4p   # Optional: runs automatic tests

• VCS: https://github.com/epics-base/p4p

• Docs: https://epics-base.github.io/p4p/

Contents:

• Quick Start
  • Troubleshooting network issues
• Overview
  • What is EPICS?
  • What is PVAccess?
  • What is a PV?
  • What is a Value?
• Building
  • Local (re)build as Python package
  • Build as EPICS Module
• Client API
  • Usage
  • API Reference
  • Qt Client
• Common Types
  • Automatic Value unwrapping
  • API Reference
• Working with Value and Type
  • Working with Type and Value
  • Type definitions
  • API Reference
  • Relation to C++ API
• Server API
  • Running a PVA Server
  • Server API
  • SharedPV concurrency options
  • SharedPV API
• RPC Server Helpers
  • Server Example
  • Client Example
  • API Reference
• Internal API
  • Ownership
  • API Reference
• PVA Gateway
  • Quick Start
  • Background
  • Command Line Arguments
  • Configuration File
  • Status PVs
  • Log File Configuration
  • Access Control Model
  • PVList File
  • ACF Rules File
  • Application Notes
  • Implementation Details

Indices and tables

• Index

• Module Index

• Search Page