Ich habe hier ein extrem simples C-Programm erstellt, welches ich benutze, um die Daten meines SolarMax Wechselrichters zu loggen. Der Mäxe ist per Ethernet an mein LAN angeschlossen, und das Programm läuft auf einer Linux-Maschine. Die Auswertung fehlt leider noch. Ich dachte mir, ich poste das mal, damit vielleicht der eine oder andere, der im Gegensatz zu mir wirklich C programmieren kann, einen Open-Source SolarMax Logger starten kann. Oder halt auch für den Eigengebrauch. Verbesserungsvorschläge sind herzlich willkommen.
C
/*
Simple solarmax logger c program written by zagibu@gmx.ch in July 2010
This program is licensed under WTFPL 2 http://sam.zoy.org/wtfpl/
# ./logger hostname port logfile loginterval
Sources:
- http://www.linuxhowtos.org/C_C++/socket.htm
- http://wwwuser.gwdg.de/~kboehm/ebook/21_kap15_w6.html#49329
- http://man.cx/setbuf%283%29
- http://www.hinz.fdns.net/timestamp-in-c-and-python.html
*/
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <time.h>
void error(char *msg)
{
perror(msg);
exit(0);
}
int main(int argc, char *argv[])
{
int sockfd, portno, n, log_interval;
struct sockaddr_in serv_addr;
struct hostent *server;
char *message1 = "{FB;01;3A|64:KDY;KMT;KYR;KT0;TNF;TKK;PAC;PRL;SYS;SAL|0E8E}";
char *message2 = "{FB;01;3E|64:IL1;IDC;UL1;UDC;PAC;PRL;KDY;KYR;KT0;SYS;SAL|0F53}";
char buffer[256];
FILE *file;
char *file_name;
char *mode = "a";
time_t *timestamp;
// Check commandline arguments
if (argc < 5)
error("ERROR program needs hostname, port, logfile and loginterval (in seconds) as parameters");
// Get log file path from command line argument
file_name = argv[3];
// Get log interval from command line argument
log_interval = atoi(argv[4]);
// Try to open socket
portno = atoi(argv[2]);
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
error("ERROR opening socket");
// Try to resolve host
server = gethostbyname(argv[1]);
if (server == NULL)
error("ERROR resolving host");
// Try to establish a connection
bzero((char *) &serv_addr, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
bcopy((char *)server->h_addr,
(char *)&serv_addr.sin_addr.s_addr,
server->h_length);
serv_addr.sin_port = htons(portno);
if (connect(sockfd,&serv_addr,sizeof(serv_addr)) < 0)
error("ERROR connecting");
// Try to open log file
if ((file = fopen(file_name, mode)) == NULL)
error("ERROR opening log file");
// Make file unbuffered
setbuf(file, NULL);
// Start sending the data requests and logging the answers
while (1) {
// Send message 1
n = write(sockfd,message1,strlen(message1));
if (n < 0)
error("ERROR writing to socket");
// Read answer
bzero(buffer, 256);
n = read(sockfd, buffer, 255);
if (n < 0)
error("ERROR reading from socket");
// Write the current timestamp to file
timestamp = time(NULL);
fprintf(file, "NOW=%d;", (int) timestamp);
// Write the answer data to file
fprintf(file, "%s;", buffer + 13);
// Send message 2
n = write(sockfd,message2,strlen(message2));
if (n < 0)
error("ERROR writing to socket");
// Read answer
bzero(buffer, 256);
n = read(sockfd, buffer, 255);
if (n < 0)
error("ERROR reading from socket");
// Write the answer data to file
fprintf(file, "%s;\n", buffer + 13);
// Wait for the specified number of seconds
sleep(log_interval);
}
return 0;
}
Alles anzeigen
Falls es schon ein anderes Open-Source Programm mit dem gleichen Zweck geben sollte, wäre ich für einen Link darauf dankbar.