c++ - GP635T GPS-sensor output of data -

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i have rather weird problem gp635t gps-sensor connected intel edison. use c++ , eclipse program it.

if try receive data this

          message = serialgps.readstr(100);           startposition = message.find('$');           endposition = message.find("\n");            std::cout << "complete message: " << message << std::endl;

i long output consisting of types of supported messages $gpgga $gptxt (see datasheet --> http://www.cypax.dk/pdf/gp-635t-121130.pdf). want work $gpgll-messages. adjusted code find index of beginning of message , end of it:

          message = serialgps.readstr(100);           startposition = message.find("$gpgll");           endposition = message.find('$', startposition+1);            std::cout << "complete message: " << message << std::endl;

but code, variable 'message' consists of 1 single message of random type. don't know why happens, because not touch variable 'message' anywhere in code.

additionally, same effect happens, if delete / comment lines message.find() out. still 1 message of random type. first code block shows long message.

i managed solve problem not receiving whole string, getting single character. code, works me.

        while(serialgps.dataavailable(10))           {               message += serialgps.readstr(1);           }

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