ESP8266 SOCK UDP 无法设置本地端口号 (GIT8266O-412)

[wivin001]

INSTRUCTIONS

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Environment

• Development Kit:
• IDF version (git rev-parse --short HEAD to get the commit id.): 4c38ff3
• Development Env: Make
• Operating System: Ubuntu18.0
• Power Supply: USB

Problem Description

代码来自example下面的udp_client.c的代码
while (1) {

        int err = sendto(sock, payload, strlen(payload), 0, (struct sockaddr *)&destAddr, sizeof(destAddr));
        if (err < 0) {
            ESP_LOGE(TAG, "Error occured during sending: errno %d", errno);
            break;
        }
        ESP_LOGI(TAG, "Message sent");

        struct sockaddr_in sourceAddr; // Large enough for both IPv4 or IPv6
        socklen_t socklen = sizeof(sourceAddr);
        sourceAddr.sin_addr.s_addr = inet_addr("255.255.255.255");
        sourceAddr.sin_family = AF_INET;
        sourceAddr.sin_port = htonl(5560);//这边设置为本地端口，但是并没有用
       // int32_t res = bind(sock,(struct sockaddr *)&sourceAddr,sizeof(sourceAddr));
        // if(res != 0){
        //     printf("bind error\n");
        // }
        int len = recvfrom(sock, rx_buffer, sizeof(rx_buffer) - 1, 0, (struct sockaddr *)&sourceAddr, &socklen);

        // Error occured during receiving
        if (len < 0) {
            ESP_LOGE(TAG, "recvfrom failed: errno %d", errno);
            break;
        }
        // Data received
        else {
            rx_buffer[len] = 0; // Null-terminate whatever we received and treat like a string
            ESP_LOGI(TAG, "Received %d bytes from %s:", len, addr_str);
            ESP_LOGI(TAG, "%s", rx_buffer);
        }

        vTaskDelay(50 / portTICK_PERIOD_MS);
    }