Espressif Systems ESP8266EX - Networking Protocol Example; UDP Transmission

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3. Sample Codes
{
󰲧󰲧󰲧󰲧test_q󰲧=󰲧xQueueCreate(Q_NUM,sizeof(void󰲧*));
󰲧󰲧󰲧󰲧xTaskCreate(test_task,(signed󰲧portCHAR󰲧*)"test_task",󰲧512,󰲧NULL,󰲧(1),󰲧&test_task_hdl󰲧);
//󰲧512󰲧means󰲧the󰲧heap󰲧size󰲧of󰲧this󰲧task,󰲧512󰲧*󰲧4󰲧byte.󰲧
//󰲧NULL󰲧is󰲧a󰲧pointer󰲧of󰲧parameter󰲧to󰲧test_task.
//󰲧(1)󰲧is󰲧the󰲧priority󰲧of󰲧test_task.
//󰲧test_task_hdl󰲧is󰲧the󰲧pointer󰲧of󰲧the󰲧task󰲧of󰲧test_task.
}
3.3. Networking Protocol Example
The networking protocol of ESP8266_RTOS_SDK is the programming of socket, including
the following examples:
• Example of UDP transmission
•
Example of TCP connection
- ESP8266 functions as TCP client
- ESP8266 functions as TCP server
3.3.1. UDP Transmission
1. Set the local port number of UDP. Below is an example of setting the port number as
1200.
#define󰲧UDP_LOCAL_PORT󰲧󰲧1200
2. Create a socket.
LOCAL󰲧int32󰲧sock_fd;
struct󰲧sockaddr_in󰲧server_addr;
memset(&server_addr,󰲧0,󰲧sizeof(server_addr));
server_addr.sin_family󰲧=󰲧AF_INET;󰲧󰲧󰲧󰲧󰲧󰲧󰲧
server_addr.sin_addr.s_addr󰲧=󰲧INADDR_ANY;
server_addr.sin_port󰲧=󰲧htons(UDP_LOCAL_PORT);
server_addr.sin_len󰲧=󰲧sizeof(server_addr);
do{
󰲧󰲧󰲧󰲧󰲧sock_fd󰲧=󰲧socket(AF_INET,󰲧SOCK_DGRAM,󰲧0);
󰲧󰲧󰲧󰲧󰲧if󰲧(sock_fd󰲧==󰲧-1)󰲧{
󰲧󰲧󰲧󰲧󰲧󰲧󰲧󰲧󰲧󰲧printf("ESP8266󰲧UDP󰲧task󰲧>󰲧failed󰲧to󰲧create󰲧sock!\n");
󰲧󰲧󰲧󰲧󰲧󰲧󰲧󰲧󰲧󰲧vTaskDelay(1000/portTICK_RATE_MS);
󰲧󰲧󰲧󰲧󰲧}
}while(sock_fd󰲧==󰲧-1);
Espressif
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2017.05