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

Stefan,

I never wrote to a serial port (except a very long time ago in BASIC),
but actually I'd do everything with POSIX file descriptor based IO functions:
open, read, write essentially.
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.

This would be something like:

NSData *yourData;
NSString *yourPath = ...;

int fd = open( [ yourPath UTF8String ], O_WRONLY, S_IRUSR );
if( fd == -1 ){
	... something wrong happened ... check for errno
}

... fill/create a valid NSData instance ...
	
write( fd, [ yourData bytes ], [ yourData length ] );

...

close( fd );

Regards.



On Oct 23, 2007, at 9:45 AM, Stefan Lehrner wrote:

Hi Half Activist,

thanks for your help! So you would suggest me, to use the 3rd choice?

Thanks again for your help!

Stefan

On Tuesday, October 23, 2007, at 12:36AM, "Half Activist" <email@hidden> wrote: 
Hi Stefan,

	there's something wrong in your third choice.
	this should be something like that:

NSData *yourData;
NSString *yourPath = ...;

NSFileHandle *fileHandle = [ NSFileHandle
fileHandleForUpdatingAtPath: yourPath ];

... fill/create a valid NSData instance ...

[ fileHandle writeData: yourData ];

...

[ fileHandle closeFile ];

Regards


On Oct 23, 2007, at 9:11 AM, Stefan Lehrner wrote:

Hi Folks,

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

I found several ways on the Internet:

1) SerialPort Sample of Apple

// Now open the modem port we found, initialize the modem, then
close it
    if (!bsdPath[0])
    {
        printf("No modem port found.\n");
        return EX_UNAVAILABLE;
    }

    fileDescriptor = OpenSerialPort(bsdPath);
    if (-1 == fileDescriptor)
    {
        return EX_IOERR;
    }

    if (InitializeModem(fileDescriptor))
    {
        printf("Modem initialized successfully.\n");
    }
    else {
        printf("Could not initialize modem.\n");
    }

2) AMSerialTest

NSString *sendString = [[inputTextField stringValue]
stringByAppendingString:@"\r"];

	if(!port) {
		// open a new port if we don't already have one
		[self initPort];
	}

	if([port isOpen]) { // in case an error occured while opening the
port
		[port writeString:sendString usingEncoding:NSUTF8StringEncoding
error:NULL];
	}

3) NSFileHandle

myPath = modempath;
			writeFile = [NSFileHandle fileHandleForUpdatingAtPath];
			[writeFile writeData:myPath];

It looks like, that the 3rd one would be the easiest way - but
where shall I put the "at-commands" there?

Thanks for your hints and tipps...

BR

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



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