Update readme

.gitignore

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 *.exe
+
+.vscode

README.md

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 # telegraf-execd-opcda
 
-[![License](http://img.shields.io/badge/license-MIT-red.svg?style=flat)](https://github.com/lpc921/telegraf-execd-opcda/blob/master/LICENSE)
-
 telegraf-execd-opcda is a [telegraf](https://github.com/influxdata/telegraf) external input plugin to gather data from OPC DA using the [konimarti/opc](https://github.com/konimarti/opc) library.
 
-## Installation
-
-Install the Graybox OPC Automation Wrapper. You can get the Graybox DA Automation Wrapper [here](http://gray-box.net/download_daawrapper.php?lang=en). Follow the installation instruction for this wrapper.
+## Usage
 
-For 32-bit OPC servers on 64-bit systems:
+* Install OPC DA Automation Wrapper 2.02 by following the installation instruction from [konimarti/opc](https://github.com/konimarti/opc) library.
 
-- copy the x86 version `gbda_aut.dll` to `C:\Windows\SysWOW64` folder;
-- register this module - enter `%systemroot%\SysWoW64\regsvr32.exe gbda_aut.dll`
-- Set go architecture - `$ENV:GOARCH=386` (powershell), or `SET GOARCH=386` (batch)
-- Build the executable `go build -o opcda.exe .\cmd\opcda\main.go`
+* Download the [latest release package](https://github.com/lpc921/telegraf-execd-opcda/releases/latest) for your platform.
 
-Create your plugin.config file
+* Edit opcda.conf as needed. Example:
 
 ```toml
 [[inputs.opcda]]
@@ -48,6 +41,29 @@ Create your plugin.config file
   ]
 ```
 
+* Edit execd plugin configuration as needed:
+
+```toml
+[[inputs.execd]]
+   command = ["/path/to/opcda", "-config", "/path/to/opcda.conf"]
+   signal = "none"
+   restart_delay = "10s"
+   data_format = "influx"
+```
+
+* Restart or reload Telegraf.
+
+## Development
+
+* Install and register OPC DA Automation Wrapper 2.02. For 32-bit OPC servers on 64-bit systems follow these steps:
+  * copy the x86 version `gbda_aut.dll` to `C:\Windows\SysWOW64` folder;
+  * register this module - enter `%systemroot%\SysWoW64\regsvr32.exe gbda_aut.dll`
+  * Set go architecture - `$ENV:GOARCH=386` (powershell), or `SET GOARCH=386` (batch)
+
+* Build the executable `go build -o opcda.exe .\cmd\opcda\main.go`
+
+* Edit opcda.conf as needed.
+
 From here, you can already test the plugin with your config file.
 
 ```ps1
@@ -60,15 +76,3 @@ If everything is ok, you should see something like this
 sim PORT.PLC.int=3i 1633624798000000000
 sim,equipment=maker1,input=temperature randomFloat=10.511474609375 1633624798000000000
 ```
-
-## Telegraf configuration
-
-To use the plugin with telegraf, add this configuration to your main telegraf.conf file. telegraf-execd-opcda is an external plugin using [shim](https://github.com/influxdata/telegraf/blob/master/plugins/common/shim/README.md) and [execd](https://github.com/influxdata/telegraf/tree/master/plugins/inputs/execd). Go see their doc for more information.
-
-```toml
-[[inputs.execd]]
-   command = ["/path/to/opcda", "-config", "/path/to/opcda.conf"]
-   signal = "none"
-   restart_delay = "10s"
-   data_format = "influx"
-```