void network_send_hello( unsigned char termid );  //create socket and send hello frame
void network_send_scan_frame( unsigned char antal, unsigned char buflen ); //sender buflen antal tegn fra global_network_char
void network_send_calc_total( void ); //send calc_total frame
void network_send_cash_payed( int amount );
void network_send_cancel_last( void );
void network_send_cancel_all( void );
void network_send_goodbye( void ); // send goodbye frame and close socket


bool network_got_reply( void ); //did we recieve an answer ??

bool network_read_acknowledge( void ); //return the acknowledge field from the last recieved frame

void network_read_int(); // putter en int i global_network_int variablen;
int network_read_char(); // putter x chars i global_network_char og returnerer x

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global_network_char
global_network_charlen; // 
global_network_amount; // indeholder beløb