How To Implement Ssl - Espressif Systems ESP8266EX Programming Manual

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3.4.4. How to Implement SSL

1. Define the IP address and port that the SSL server will be connected to.
#define SSL_SERVER_IP "115.29.202.58"
#define SSL_SERVER_PORT 443
esp_test *pTestParamer = (esp_test *)zalloc(sizeof(esp_test));
pTestParamer->ip.addr = ipaddr_addr(SSL_SERVER_IP);
pTestParamer->port = server_port;
2. Create a new task when the device functions as an SSL client.
xTaskCreate(esp_client, "esp_client", 1024, (void*)pTestParamer, 4, NULL);
3. When ESP8266 functions as a Station, connect it to a router. Then check if it has
already obtained the IP address before setting up the SSL connection.
struct ip_info ipconfig;
Wi-Fi_get_ip_info(STATION_IF, &ipconfig);
while (ipconfig.ip.addr == 0) {
vTaskDelay(1000 / portTICK_RATE_MS);
Wi-Fi_get_ip_info(STATION_IF, &ipconfig);
}
4. Create a socket connection.
client_fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (client_fd < 0){
printf("create with the socket err\n");
}
memset(&client_addr, 0, sizeof(client_addr));
client_addr.sin_family = AF_INET;
client_addr.sin_port = htons(port);
client_addr.sin_addr.s_addr = sin_addr;
if(connect(client_fd, (struct sockaddr *)&client_addr, sizeof(client_addr))< 0)
printf("connect with the host err\n");
5. Create the context of SSL. Please call system_get_free_heap_size to check the
memory space available, since the SSL requires a relatively large amount of space.
uint32 options = SSL_SERVER_VERIFY_LATER|SSL_DISPLAY_CERTS|SSL_NO_DEFAULT_KEY;
if ((ssl_ctx = ssl_ctx_new(options, SSL_DEFAULT_CLNT_SESS)) == NULL){
printf("Error: Client context is invalid\n");
}
Espressif 31 37 ! /!
3. Sample Codes
2017.05