First issue noticed in your block diagrams is the EOL constant, which is CR in LabVIEW for ARM
#define SSEOL ‘\r’ in CCodeGen\include\os\rtx\LVDefs_plat.h (seems to be a Mac:)
Modifying it might help, but I don't know how this affects other modules.
Do not think to replace EOL in block diagram with a "\r\n" string constants because code generator will write SSEOL in the C files for any two characters string constants \r\n. A solution could be writing constant such, e.g. "\r\n.\r\n" for end of message.
The error shown in your image is not so strange - it’s a corrupted heap memory error. Perhaps there is an improper interface between LabVIEW strings and zero terminated C strings. Try to add a NULL at the end of the server address (i.e. "server01.iacontrol.com\00" , if you select Code Display for that constant, BTW-perhaps the domain is iacontrols).
Few questions are looking for answers before going further:
Does the board connect to the server? (put a CCG Error Handler.vi after TCP Open Connection and watch the error in runtime)
If the connection is established, how many packets are sent/recv before an error occurred? (e.g. put a One Button Dialog after TCP Read).
If the connection is not established, can the board connect elsewhere? Which versions are you using? (LabVIEW and MDK-ARM)
P.S. It is fair to wait for "220" before transmitting "HELO"
