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Re: Writing an "AT-Command" to a Modem

Subject: Re: Writing an "AT-Command" to a Modem
From: Andreas Mayer <email@hidden>
Date: Tue, 23 Oct 2007 16:16:02 +0200
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Am 23.10.2007 um 09:11 Uhr schrieb Stefan Lehrner:

what is the best way to send an "AT-Command" to a Modem?


There is no "best way". It depends on what you need.

Also, all “three ways“ you listed are very similar. AMSerialPort ist based on Apple's SerialPort sample. It just wraps the necessary procedures in Cocoa classes. And you can, of course, use the file handle returned from AMSerialPort -open to directly write to the serial device.

Am 23.10.2007 um 10:14 Uhr schrieb Half Activist:

Because I suppose you'll come across buffer problems with other methods and you'd run into data you write but never comes out to the serial port, and do quite a lot of flushing.


Why do you think so?

write( fd, [ yourData bytes ], [ yourData length ] );


Well, that's what AMSerialPort does:

- (BOOL)writeData:(NSData *)data error:(NSError **)error
{
	BOOL result = NO;

	const char *dataBytes = [data bytes];
	unsigned dataLen = [data length];
	ssize_t bytesWritten = 0;
	int errorCode = kAMSerialErrorNone;
	if (dataBytes && (dataLen > 0)) {
		bytesWritten = write(fileDescriptor, dataBytes, dataLen);


As I said: These “different ways“ are actually quite similar.


Andreas_______________________________________________

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References:
	>Writing an "AT-Command" to a Modem (From: Stefan Lehrner <email@hidden>)

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