# How to write a client use ignitionSDK?

**URL:** <https://forum.inductiveautomation.com/t/how-to-write-a-client-use-ignitionsdk/5517>\
**Category:** General Discussion\
**Created:** [December 3, 2012, 9:03am UTC](https://forum.inductiveautomation.com/t/how-to-write-a-client-use-ignitionsdk/5517 "2012-12-03T09:03:11Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Louis\_lai](https://avatars.discourse-cdn.com/v4/letter/l/a88e4f/32.png) [@Louis\_lai](https://forum.inductiveautomation.com/u/Louis_lai)\
**Post date:** [December 3, 2012, 9:03am UTC](https://forum.inductiveautomation.com/t/how-to-write-a-client-use-ignitionsdk/5517/1 "2012-12-03T09:03:11Z")

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I wanted to use the ignition SDK to write a client, but I don’t know the general steps, I’ve tried to do it for over a week, but still have no any clues, can somebody help me out of here? 😮😮

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**Author:** ![Travis.Cox](https://avatars.discourse-cdn.com/v4/letter/t/b9bd4f/32.png) [@Travis.Cox](https://forum.inductiveautomation.com/u/Travis.Cox)\
**Post date:** [December 3, 2012, 4:18pm UTC](https://forum.inductiveautomation.com/t/how-to-write-a-client-use-ignitionsdk/5517/2 "2012-12-03T16:18:13Z")

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What exactly are you trying to do?

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**Author:** ![Louis\_lai](https://avatars.discourse-cdn.com/v4/letter/l/a88e4f/32.png) [@Louis\_lai](https://forum.inductiveautomation.com/u/Louis_lai)\
**Post date:** [December 4, 2012, 12:15am UTC](https://forum.inductiveautomation.com/t/how-to-write-a-client-use-ignitionsdk/5517/3 "2012-12-04T00:15:20Z")

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Just connect to the OPC server and monitor the tag changes. but things stuck at connect step, I write a ClientGatewayConnection class that implements AbstractGatewayConnection, when I use the connect method, I got “Post error, error code = 405”. what can I do with that?

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**Author:** ![greg.simpson](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/greg.simpson/32/3135_2.png) [@greg.simpson](https://forum.inductiveautomation.com/u/greg.simpson)\
**Post date:** [December 4, 2012, 11:58pm UTC](https://forum.inductiveautomation.com/t/how-to-write-a-client-use-ignitionsdk/5517/4 "2012-12-04T23:58:38Z")

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Some more information would be very useful. The message you’re receiving is a “method is not allowed” error. What kind of OPC server are you trying to connect to and what type of device (PLC, etc.) are you trying to monitor tags on?