I need to open a tcp port, send an xml message and check the result string for a given value. I believe check_tcp should work perfect for this using the -s and -e options. However, I have to include a char(28) character at the end of the send string in order for the listening app to realize it has the complete message. Could anyone tell me how to include a non-printable control character as part of the service command? Should I be using a different plugin to accomplish the test?