Asynchronous: Twisted ===================== `Twisted <http://twistedmatrix.com>`_ is quite old and widly used I/O framework. With Twisted, your code will mostly live in isolated functions, but unlike as it is with callback-based design, with Twisted work-in-progress is represented by a :class:`~twisted.internet.defer.Deferred` class instance effectively carrying state and context of running operation. Your callback functions will be attached to these *Deferred* objects and invoked as *Deferred* is done. Based on *Twisted* infrastructure, individual asynchronous functions could be chained to run sequentially or in parallel. In most examples approximate analogues of well known Net-SNMP snmp* tools command line options are shown. That may help those readers who, by chance are familiar with Net-SNMP tools, better understanding what example code doe Here's a quick example on a simple SNMP GET by high-level API: .. include:: /../../examples/hlapi/twisted/manager/cmdgen/v1-get.py :start-after: options: :end-before: Functionally .. literalinclude:: /../../examples/hlapi/twisted/manager/cmdgen/v1-get.py :start-after: """# :language: python To make use of SNMPv3 and USM, the following code performs a series of SNMP GETNEXT operations effectively fetching a table of SNMP variables from SNMP Agent: .. include:: /../../examples/hlapi/twisted/manager/cmdgen/getbulk-to-eom.py :start-after: options: :end-before: Functionally .. literalinclude:: /../../examples/hlapi/twisted/manager/cmdgen/getbulk-to-eom.py :start-after: """# :language: python More examples on Command Generator API usage follow. .. toctree:: /examples/hlapi/twisted/manager/cmdgen/snmp-versions /examples/hlapi/twisted/manager/cmdgen/walking-operations /examples/hlapi/twisted/manager/cmdgen/transport-tweaks /examples/hlapi/twisted/manager/cmdgen/advanced-topics Sending SNMP TRAP's and INFORM's is as easy with PySNMP library. The following code sends SNMP TRAP: .. include:: /../../examples/hlapi/twisted/agent/ntforg/default-v1-trap.py :start-after: options: :end-before: Functionally .. literalinclude:: /../../examples/hlapi/twisted/agent/ntforg/default-v1-trap.py :start-after: """# :language: python More examples on Notification Originator API usage follow. .. toctree:: /examples/hlapi/twisted/agent/ntforg/common-notifications /examples/hlapi/twisted/agent/ntforg/advanced-topics More sophisticated or less popular SNMP operations can still be performed with PySNMP through its Native API to Standard SNMP Applications.