API unit test script

tests/api_test/tcp_server.c

@@ -0,0 +1,67 @@
+// TCP Server test program
+
+#include <stdio.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <arpa/inet.h> 
+#include <unistd.h>  
+ 
+int atoi(const char *str);
+
+int main(int argc , char *argv[])
+{
+    if(argc < 2) {
+	   printf("usage: tcp_server <port>\n");
+       return 0;
+    }
+   
+    int socket_desc, client_sock, c, read_size, port = atoi(argv[1]);
+    struct sockaddr_in server , client;
+    char client_message[2000];
+     
+    socket_desc = socket(AF_INET , SOCK_STREAM , 0);
+    if (socket_desc == -1) {
+        printf("could not create socket");
+        return 0;
+    }
+     
+    server.sin_family = AF_INET;
+    server.sin_addr.s_addr = INADDR_ANY;
+    server.sin_port = htons(port);
+     
+    printf("binding on port %d\n", port);
+    if( bind(socket_desc,(struct sockaddr *)&server , sizeof(server)) < 0) {
+        perror("bind failed. Error");
+        return 0;
+    }
+    printf("listening\n");
+    listen(socket_desc , 3); 
+    printf("waiting to accept\n");
+    c = sizeof(struct sockaddr_in);
+    
+    client_sock = accept(socket_desc, (struct sockaddr *)&client, (socklen_t*)&c);
+    if (client_sock < 0) {
+        perror("accept failed");
+        return 0;
+    }
+    printf("connection accepted\n reading...\n");
+     
+    // RX
+
+    int msglen = 1024;
+    unsigned long count = 0;
+    while(1)
+    {
+        count++;
+       int bytes_read = read(client_sock, client_message, msglen);
+       printf("[%lu] RX = (%d): ", count, bytes_read);
+       for(int i=0; i<bytes_read; i++) {
+          printf("%c", client_message[i]);
+       }
+
+       // TX
+       int bytes_written = write(client_sock, "Server here!", 12); 
+       printf("\t\nTX = %d\n", bytes_written);
+    }
+    return 0;
+}