more improvements:

1. New optional flag to redirect print to stderr. THis can be useful on
host environemtns (e.g linux)
2. non-buffered mode if this flag is true: the preamble msut be printed
manually
2. Getter function for preamble for that case.
3. printChar function: specify whether to print to stderr or stdout

serviceinterface/ServiceInterfaceStream.cpp

@@ -1,11 +1,15 @@
 #include <framework/serviceinterface/ServiceInterfaceStream.h>
 
+ServiceInterfaceStream::ServiceInterfaceStream(std::string setMessage,
+		bool errStream, bool addCrToPreamble, uint16_t port) :
+		std::ostream(&buf),
+		buf(setMessage, errStream, addCrToPreamble, port) {
+}
+
 void ServiceInterfaceStream::setActive( bool myActive) {
 	this->buf.isActive = myActive;
 }
 
-ServiceInterfaceStream::ServiceInterfaceStream(std::string set_message,
-		bool addCrToPreamble, uint16_t port) :
-		std::basic_ostream<char, std::char_traits<char>>(&buf),
-		buf(set_message, port, addCrToPreamble) {
+std::string ServiceInterfaceStream::getPreamble() {
+	return buf.getPreamble();
 }