adjust code to read until new character is encountered. Example code now tests for this.

Examples/SwiftSerialExample/Sources/main.swift

@@ -5,6 +5,10 @@ print("You should do a loopback i.e short the TX and RX pins of the target seria
 
 let testString: String = "The quick brown fox jumps over the lazy dog 01234567890."
 
+let numberOfMultiNewLineTest : Int = 5
+
+let test3Strings: String = testString + "\n" + testString + "\n" + testString + "\n"
+
 let arguments = CommandLine.arguments
 guard arguments.count >= 2 else {
     print("Need serial port name, e.g. /dev/ttyUSB0 as the first argument.")
@@ -15,6 +19,8 @@ let portName = arguments[1]
 let serialPort: SerialPort = SerialPort(path: portName)
 
 do {
+
+    print("Attempting to open port: \(portName)")
     try serialPort.openPort()
     print("Serial port \(portName) opened successfully.")
     defer {
@@ -41,6 +47,36 @@ do {
         print("<\(stringReceived)>")
     }
 
+
+    print("Now testing reading/writing of \(numberOfMultiNewLineTest) lines")
+
+    var multiLineString: String = ""
+
+
+    for i in 1...numberOfMultiNewLineTest { 
+        multiLineString += testString + "\n"
+    }
+
+    print("Now writing multiLineString")
+
+    var _ = try serialPort.writeString(multiLineString)
+
+
+    for i in 1...numberOfMultiNewLineTest {
+        let stringReceived = try serialPort.readLine()
+          
+        if testString == stringReceived {
+            print("Received string \(i) is the same as transmitted section. Moving on...")
+        } else {
+            print("Uh oh! Received string \(i) is not the same as what was transmitted. This was what we received,")
+            print("<\(stringReceived)>")
+            break
+        }
+    }
+
+
+    print("We successfully received back \(numberOfMultiNewLineTest) lines")
+
 } catch PortError.failedToOpen {
     print("Serial port \(portName) failed to open. You might need root permissions.")
 } catch {

Sources/SwiftSerial.swift

@@ -420,14 +420,18 @@ extension SerialPort {
             buffer.deallocate(capacity: 1)
         }
 
-        // Read byte by byte
+        while true {
-        while try readBytes(into: buffer, size: 1) > 0 {
+        	let bytesRead = try readBytes(into: buffer, size: 1)
-            let character = CChar(buffer[0])
+
-            if character != terminator {
+        	if bytesRead > 0 {
-                data.append(buffer, count: 1)
+        		let character = CChar(buffer[0])
-            } else {
+                
-                break
+                if character == terminator {
-            }
+                    break
+                } else {
+                    data.append(buffer, count: 1)
+                }
+        	}
         }
 
         if let string = String(data: data, encoding: String.Encoding.utf8) {