Espressif Systems ESP8266EX - ESP-LAUNCHER Development Board

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3. Sample Codes

#define󰲧SERVER_IP󰲧󰲧󰲧󰲧󰲧󰲧󰲧󰲧"192.168.1.124"

#define󰲧SERVER_PORT󰲧󰲧󰲧󰲧󰲧󰲧󰲧󰲧1001

3. Implement the TCP communication via socket programming.

Create a socket:

󰲧󰲧󰲧󰲧sta_socket󰲧=󰲧socket(PF_INET,󰲧SOCK_STREAM,󰲧0);

󰲧󰲧󰲧󰲧if󰲧(-1󰲧==󰲧sta_socket)󰲧{

󰲧󰲧󰲧󰲧󰲧󰲧󰲧󰲧close(sta_socket);

󰲧󰲧󰲧󰲧󰲧󰲧󰲧󰲧vTaskDelay(1000󰲧/󰲧portTICK_RATE_MS);

󰲧󰲧󰲧󰲧󰲧󰲧󰲧󰲧printf("ESP8266󰲧TCP󰲧client󰲧task󰲧>󰲧socket󰲧fail!\n");

󰲧󰲧󰲧󰲧󰲧󰲧󰲧󰲧continue;

󰲧󰲧󰲧󰲧}

󰲧󰲧󰲧󰲧printf("ESP8266󰲧TCP󰲧client󰲧task󰲧>󰲧socket󰲧ok!\n");

Create a TCP connection:

󰲧󰲧󰲧󰲧bzero(&remote_ip,󰲧sizeof(struct󰲧sockaddr_in));

󰲧󰲧󰲧󰲧remote_ip.sin_family󰲧=󰲧AF_INET;

󰲧󰲧󰲧󰲧remote_ip.sin_addr.s_addr󰲧=󰲧inet_addr(SERVER_IP);

󰲧󰲧󰲧󰲧remote_ip.sin_port󰲧=󰲧htons(SERVER_PORT);

󰲧󰲧󰲧󰲧if󰲧(0󰲧!=󰲧connect(sta_socket,󰲧(struct󰲧sockaddr󰲧*)(&remote_ip),󰲧sizeof(struct󰲧sockaddr)))󰲧

{

󰲧󰲧󰲧󰲧󰲧󰲧󰲧󰲧close(sta_socket);

󰲧󰲧󰲧󰲧󰲧󰲧󰲧󰲧vTaskDelay(1000󰲧/󰲧portTICK_RATE_MS);

󰲧󰲧󰲧󰲧󰲧󰲧󰲧󰲧printf("ESP8266󰲧TCP󰲧client󰲧task󰲧>󰲧connect󰲧fail!\n");

󰲧󰲧󰲧󰲧󰲧󰲧󰲧󰲧continue;

󰲧󰲧󰲧󰲧}

󰲧󰲧󰲧󰲧printf("ESP8266󰲧TCP󰲧client󰲧task󰲧>󰲧connect󰲧ok!\n");

Send data packets via TCP communication:

󰲧󰲧󰲧󰲧if󰲧(write(sta_socket,󰲧pbuf,󰲧strlen(pbuf)󰲧+󰲧1)󰲧<󰲧0){

󰲧󰲧󰲧󰲧󰲧󰲧󰲧󰲧close(sta_socket);

󰲧󰲧󰲧󰲧󰲧󰲧󰲧󰲧vTaskDelay(1000󰲧/󰲧portTICK_RATE_MS);

󰲧󰲧󰲧󰲧󰲧󰲧󰲧󰲧printf("ESP8266󰲧TCP󰲧client󰲧task󰲧>󰲧send󰲧fail\n");

󰲧󰲧󰲧󰲧󰲧󰲧󰲧󰲧continue;

󰲧󰲧󰲧󰲧}

󰲧󰲧󰲧󰲧printf("ESP8266󰲧TCP󰲧client󰲧task󰲧>󰲧send󰲧success\n");

󰲧󰲧󰲧󰲧free(pbuf);

Receive data packets via TCP communication:

󰲧󰲧󰲧󰲧char󰲧*recv_buf󰲧=󰲧(char󰲧*)zalloc(128);

󰲧󰲧󰲧󰲧while󰲧((recbytes󰲧=󰲧read(sta_socket󰲧,󰲧recv_buf,󰲧128))󰲧>󰲧0)󰲧{

󰲧󰲧󰲧󰲧󰲧󰲧󰲧󰲧recv_buf[recbytes]󰲧=󰲧0;

Espressif

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2017.05

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