void transport_receiver(unsigned char *buffer, size_t buffer_len) {
// the buffer contains the whole message, with transport escape sequences.
// these escape sequences are stripped here.
sml_file *file = sml_file_parse(buffer + 8, buffer_len - 16);
// the sml file is parsed now
// read here some values ..
// this prints some information about the file
sml_file_print(file);
// free the malloc'd memory
sml_file_free(file);
}
size_t meter_read_sml(meter_t *meter, reading_t rds[], size_t n) {
meter_handle_sml_t *handle = &meter->handle.sml;
unsigned char buffer[SML_BUFFER_LEN];
size_t bytes, m = 0;
sml_file *file;
sml_get_list_response *body;
sml_list *entry;
/* blocking read from fd */
bytes = sml_transport_read(handle->fd, buffer, SML_BUFFER_LEN);
/* parse SML file & stripping escape sequences */
file = sml_file_parse(buffer + 8, bytes - 16);
/* obtain SML messagebody of type getResponseList */
for (short i = 0; i < file->messages_len; i++) {
sml_message *message = file->messages[i];
if (*message->message_body->tag == SML_MESSAGE_GET_LIST_RESPONSE) {
body = (sml_get_list_response *) message->message_body->data;
entry = body->val_list;
/* iterating through linked list */
for (m = 0; m < n && entry != NULL; m++) {
meter_sml_parse(entry, &rds[m]);
entry = entry->next;
}
}
}
/* free the malloc'd memory */
sml_file_free(file);
return m+1;
}
ssize_t MeterSML::read(std::vector<Reading> &rds, size_t n) {
unsigned char buffer[SML_BUFFER_LEN];
size_t bytes, m = 0;
sml_file *file;
sml_get_list_response *body;
sml_list *entry;
/* wait until a we receive a new datagram from the meter (blocking read) */
bytes = sml_transport_read(_fd, buffer, SML_BUFFER_LEN);
/* parse SML file & stripping escape sequences */
file = sml_file_parse(buffer + 8, bytes - 16);
/* obtain SML messagebody of type getResponseList */
for (short i = 0; i < file->messages_len; i++) {
sml_message *message = file->messages[i];
if (*message->message_body->tag == SML_MESSAGE_GET_LIST_RESPONSE) {
body = (sml_get_list_response *) message->message_body->data;
entry = body->val_list;
/* iterating through linked list */
for (m = 0; m < n && entry != NULL; m++) {
_parse(entry, &rds[m]);
entry = entry->next;
}
}
}
/* free the malloc'd memory */
sml_file_free(file);
return m+1;
}