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


  • Subject: Re: Writing an "AT-Command" to a Modem
  • From: Half Activist <email@hidden>
  • Date: Tue, 23 Oct 2007 09:36:43 +0200

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>)

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