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camer_client.c

+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <pthread.h>
+#include <fcntl.h>
+#include <linux/spi/spidev.h>
+#include <linux/types.h>
+#include <stdint.h>
+#include <sys/ioctl.h>
+#include <arpa/inet.h>
+#include <netinet/in.h>
+#include <sys/socket.h>
+
+int sock;
+
+void error_handling(const char *message, int sock) {
+    close(sock);
+    perror(message);
+    fputc('\n', stderr);
+    exit(1);
+}
+
+int main(int argc, char* argv[]) {
+    struct sockaddr_in server_addr; 
+    char picture;
+    ssize_t read_stat;
+
+    if (argc != 3) { 
+        printf("Please deliver IP & Port num as arguments Correctly!\n");
+        exit(1);
+    }
+
+    sock = socket(PF_INET, SOCK_STREAM, 0);
+    if (sock == -1) 
+        error_handling("socket() error", sock);
+
+    memset(&server_addr, 0, sizeof(server_addr));
+    server_addr.sin_family = AF_INET;
+    server_addr.sin_addr.s_addr = inet_addr(argv[1]);
+    server_addr.sin_port = htons(atoi(argv[2]));
+
+    if (connect(sock, (struct sockaddr *)&server_addr, sizeof(server_addr)) == -1) 
+        error_handling("connect() error", sock); 
+
+    while (1) {
+        read_stat = read(sock, &picture, 1);
+        if (read_stat == -1) {
+            perror("Client Output; reading data from socket error");
+            exit(1);
+        } else if (read_stat == 0) {
+            break;
+        } else {
+            if (!strncmp(&picture, "1",1)) {
+                system("raspistill -o image.jpg");
+                sleep(1);
+                system("python3 send_email2.py");
+            }
+        }
+    }
+
+    return 0;
+}