From 9799f402e77e5d69b0811b6c714b172d9ccdd768 Mon Sep 17 00:00:00 2001
From: Piv <18462828+Piv200@users.noreply.github.com>
Date: Sat, 4 Jul 2020 15:14:43 +0930
Subject: [PATCH] Add dtr property to SerialPort

---
 Sources/SwiftSerial.swift | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/Sources/SwiftSerial.swift b/Sources/SwiftSerial.swift
index 2b9c8fc..94e56e7 100644
--- a/Sources/SwiftSerial.swift
+++ b/Sources/SwiftSerial.swift
@@ -217,6 +217,7 @@ public class SerialPort {
 
     var path: String
     var fileDescriptor: Int32?
+    private var dtrState = false
 
     public init(path: String) {
         self.path = path
@@ -365,6 +366,24 @@ public class SerialPort {
         }
         fileDescriptor = nil
     }
+    
+    public var dtr: Bool {
+        get{
+            return dtrState
+        }
+        set (value){
+            // TODO: Add error handling.
+            guard let fileDescriptor = fileDescriptor else {
+                // Need to open port first.
+                return
+            }
+            dtrState = value
+            var flags = TIOCM_DTR
+            if(ioctl(fileDescriptor, dtrState ? TIOCMBIS : TIOCMBIC, &flags) != 0){
+                
+            }
+        }
+    }
 }
 
 // MARK: Receiving