SwiftLibModbus

This is a Swift port of Lars-Jørgen Kristiansen's ObjectiveLibModbus. For those who are not familiar with his work, it is a wrapper class for the libmodbus library.

Currently, this project is a direct port of ObjectiveLibModbus. I tried to stay true to his code as much as I can, but moving forward, my plan is to include more of the features available in libmodbus and adding 32-bit data support. I'm also planning on adding features such as reading data from non-consecutive addresses (i.e. address 1, 10, and 20). I will try to port back those features to ObjectiveLibModbus as well.

Just in case if you were wondering...

I started this project for few reasons. I originally used ObjectiveLibModbus in my modbus communication app and it worked amazingly well, but it was an unwrapping nightmare for closures (having to do things like (([AnyObject]!) -> Void)! because of Swift). I also noticed that many people were looking for a Swift Modbus Library (ok, it's not truly a Swift library but one step closer). And through this project, I'm learning the differences between Swift and Objective-C.

Oh, and one more thing...

Please feel free to add, modify, suggest, comment, or whatever.

How To Get Started

• Drag all the .c and .h files from the Vendor/libmodbus folder into your project.
• Drag SwiftLibModbus.swift and SwiftLibModbus-Bridging-Header.h into your project from SwiftLibModbus folder.
• Make sure to add SwiftLibModbus-Bridging-Header.h to the project's Build Setting. If you already have a Bridging Header, copy and paste the content of SwiftLibModbus-Bridging-Header.h to your Bridging Header.

Now that you're set up, do the following to make modbus calls

• Now make a new instance of SwiftLibModbus and connect:

let swiftLibModbus = SwiftLibModbus(ipAddress: "192.168.2.10", port: 502, device: 1)
swiftLibModbus.connect(
    { () -> Void in
        //connected and ready to do modbus calls
    },
    failure: { (error: NSError) -> Void in
        //Handle error
        print("error")
})

• Make a modbus call:

swiftLibModbus.readBitsFrom(1000, count: 5,
    success: { (array: [AnyObject]) -> Void in
        //Do something with the returned data (NSArray of NSNumber)..
        print("success: \(array)")
    },
    failure:  { (error: NSError) -> Void in
        //Handle error
        print("error")
})

• Disconnect when you are finished with you’re modbus calls:

swiftLibModbus.disconnect()