After reading the link you attached here it looks like i need to send a message asking for the value. once i receive the parameter value i can enter it into the code in the previous post. l should use PARAM_REQUEST_READ and the parameter id of “RC7_OPTION” in the message i send. Could you help with syntax in C#? how to send a mavlink message in C#?
No, you don’t need to read a parameter before setting it. I don’t know what you mean by “plug-in,” nor do I have any idea what C# libraries, interfaces, methods, etc you are using. As such, it is impossible to just give you the syntax for what you desire.
The following code snippet is a working Python example to set RC7_OPTION to a value of 300 using the pymavlink library, assuming you have a MAVLink connection available on localhost:14550: