Comments by sach262 (Top 34 by date)

Thanks for clearing that up for me Walt. All i am doing is sending a compiled python file (as a text file) to my modem via the serial port in C#. So you saying I dont have to worry about appending CR and LF to each line in the text file before I send it via the serial port? Can I just read the file into a stream object and send it using ASCII encoding??

thanks, i got it working now. just battling now to send the compiled file to my modem over the serial port..

ok i got it working now, thanks, had to make it true and then also close the file afterwards

Hi Mopane, no I still am struggling with this. Any ideas???

Sorry my apologies! It does work , the line does not disappear but after the operation that line in the text file moved around. It doesn't keep its place.

I tried your new suggestion. But when I check the text file afterwards the entire login = '. login username password\r\n' line has disappeared. what do you think?

Thanks for all the help

wow, ok im going to try this right now and I will let you know of the outcome! thank you!

Thanks for the reply

do you mean open the python.exe compiler myself, and type my commands in? If so , I have done this.

Hey Abhinav

I tried your suggestion , still does not work :(

Hi Manfred

Thanks for the reply

I have tried that , but still have the same problem. Instead of replacing the entire login line , it only replaces the "login= " part of that line and not the entire line.

thanks Manfred. appreciated

Thank you for clearing that up for me:)

lol yeah I have implemented it, just wish i had a device to monitor resources like RAM on this modem i am using. thank you and take care

At the moment I am keeping the TCP connection open constantly because I am polling the status response from an IMAP server to determine if new email has arrived. When a new email arrives I send out an SMS. Since it is an embedded application , I want to optimize speed of execution on the client embedded side, hence I keep the connection open to the IMAP server so I dont have to waste time in disconnecting and connecting again.

I assume keeping the connection open constantly is more resource intensive for the server than it is for my embedded client.

Thank you

I tried this as you suggested but this did not work. I am sending a text file, and the modem requires the file to have line ends that end with line feeds. Since I am sending a text file i need to use ascii transfer mode and not binary transfer, dont you think??

Thanks Nijboer.

Your statement about UNIX now makes sense. UNIX text files and windows text files are different as you implied in your previous post. Since the modem manual specifies send line ends with line feeds, the text file needs to be in the UNIX format. I used a little utility to convert the windows text file into a Unix text file and then tried sending it using the binary reader approach, but this still resulted in error.

My apologies, since I am sending a text file I need to send the file in ascii mode. Therefore I assume my approach using the binary reader is wrong. How do I send the UNIX file in ascii mode?

yes from hyperterminal i use the send text file with those properties enabled, and it works correctly

Thank you for your response Rajesh. My port encoding was already set to Encoding.GetEncoding("iso-8859-1"), but I changed it as you suggested. Still I can see the data being sent to the modem, but the modem gives an error.

Dont you think the send line ends with line feeds properties etc that I mentioned above have an effect?

Thank you

The modem specifies that the file when sent in hyperterminal, you must enable the options: send line ends with line feeds and Append line feeds to incoming line ends.

How do you think this would effect the binary data stream?

Thank you for your response.

The modem receives and acknowledges the file perfectly when I send it with hyperterminal and enable the above options: send line ends with line feeds and Append line feeds to incoming line ends.

Do you think maybe I should try send it as a byte array perhaps and not use the binary reader?

aah yes line feed and carriage return. I shall check \r\n then at each line to split it up.
Thanks alot!

Ok cool thanks Nishant bhai. Since it is an embedded application buffer size is an issue. I will store the entire response in a string and then start processing it.

Thank you

Thanks James. Ok Looks like I will have to receive the entire stream and then start my processing on it. I have tried to process the data line by line inside the modem using the modem's python engine but this does not work well compared to processing line by line on a pc C# application for example.

I am writing my own code in python because the GPRS modem has an embedded python engine. So the entire application is embedded inside the GPRS modem. I cannot use built in python pop library because of the special GPRS commands of the modem.

Anyway I have successfully implemented the POP3 protocol, downloading entire header information etc. But I am now trying to streamline my application by only processing specific lines from the server response such as the "from" and "subject" lines.

I am aware that the server sends multi-line responses, but are they sent as a continuous stream of bytes or are they sent one line at a time?

The optimize code check box was checked all this time. I unchecked it and tried to run my code again, but no luck. I researched a bit into the foreach statement. According to some resources the foreach statement in C# will only work with enumerable objects. The class DecodedShortMesssage messages is a custom object and I assume the creator of this library did not make the DecodedShortMessage class an enumerable object collection. I am not sure if this is correct since I do not have much experience with C#.
Back to the drawing board i guess...thanks again.

On closer inspection of the code during debugging and using breakpoints I have realized that the line: foreach (DecodedShortMessage message in messages) is actually not being executed at all!! For some reason the code just ignores it. Hence the NullReferenceException when I forced the line: SmsPdu smsrec = message.Data to occur in the debugger.
So the real issue is why the foreach statement is not being executed??

ok cool , thanks for your help,i will try track the message array through the code and check when it is becoming null.

thanks for your reply! Yes i also suspected maybe an object is being set to null. I have updated the question and specified the error for you better.