Added allowsNonStandardBaudRates setting. Defaults to NO. See discuss…

…ion on pull request #49.

Source/ORSSerialPort.h

@@ -328,7 +328,8 @@ typedef NS_ENUM(NSUInteger, ORSSerialPortParity) {
 /**
  *  The baud rate for the port.
  *
- *  This value should be one of the values defined in termios.h:
+ *  Unless supportsNonStandardBaudRates is YES, 
+ *  this value should be one of the values defined in termios.h:
  *
  *	- 0
  *	- 50
@@ -356,6 +357,23 @@ typedef NS_ENUM(NSUInteger, ORSSerialPortParity) {
  */
 @property (nonatomic, copy) NSNumber *baudRate;
 
+/**
+ *  Whether or not the port allows setting non-standard baud rates.
+ *  Set this property to YES to allow setting non-standard baud rates
+ *  for the port. The default is NO.
+ *
+ *  @note Support for non-standard baud rates
+ *  depends on the serial hardware and driver being used. Even
+ *  for hardware/drivers that support non-standard baud rates,
+ *  it may be that not all baud rates are supported.
+ *  ORSSerialPort may *not* report an error when setting
+ *  a non-standard baud rate, nor will the baudRate getter return
+ *  the actual baud rate when non-standard baud rates are
+ *  used. This option should only be used when necessary,
+ *  and should be used with caution.
+ */
+@property (nonatomic) BOOL allowsNonStandardBaudRates;
+
 /**
  *  The number of stop bits. Values other than 1 or 2 are invalid.
  */

Source/ORSSerialPort.m

@@ -174,6 +174,7 @@ - (instancetype)initWithDevice:(io_object_t)device;
 		self.requestsQueue = [NSMutableArray array];
 		self.selectSemaphore = dispatch_semaphore_create(1);
 		self.baudRate = @B19200;
+		self.allowsNonStandardBaudRates = NO;
 		self.numberOfStopBits = 1;
 		self.parity = ORSSerialPortParityNone;
 		self.shouldEchoReceivedData = NO;
@@ -600,15 +601,17 @@ - (void)setPortOptions;
 	cfsetspeed(&options, [[self baudRate] unsignedLongValue]);
 
 	int result = tcsetattr(self.fileDescriptor, TCSANOW, &options);
-    if (result != 0) {
-        // Try to set baud rate via ioctl if normal port settings fail
-        int new_baud = [[self baudRate] intValue];
-        result = ioctl(self.fileDescriptor, IOSSIOSPEED, &new_baud, 1);
-        if (result == -1) {
-            // Notify delegate of port error stored in errno
-            [self notifyDelegateOfPosixError];
-        }
-    }
+	if (result != 0) {
+		if (self.allowsNonStandardBaudRates) {
+			// Try to set baud rate via ioctl if normal port settings fail
+			int new_baud = [[self baudRate] intValue];
+			result = ioctl(self.fileDescriptor, IOSSIOSPEED, &new_baud, 1);
+		}
+		if (result != 0) {
+			// Notify delegate of port error stored in errno
+			[self notifyDelegateOfPosixError];
+		}
+	}
 }
 
 + (io_object_t)deviceFromBSDPath:(NSString *)bsdPath;