Hi Miguel, > What is interesting is that in the TT_DownUplink_IF.h and TT_DownUplink_IF.cpp we have a method called virtual void ReceiveTelecommand ( String8 buf, Int32& size ); What's more interesting is that there is no method called: virtual void ReceiveTelecommand(unsigned char*, Smp::Int32); And also that dataToPass isn't in the TT_TTCStream::RcvTelecommand method. Sincerely, --Eljay