void com_done(void) { } int com_init(void) { return 0; } int com_read(char *buffer, int len, int timeout_value) { return -1; } int com_write(char *buffer, int len) { return -1; } void com_port_hangup() { } int com_getdcd() { return -1; } void com_flushbuffers() { } void com_setbaudrate(int rate) { } int com_readline(int timeout_value, char *input_buffer,int len) { return 0; }