ESP8266 Community Forum

- Sat Oct 13, 2018 12:57 am #78605 Hi everybody!

I have a sketch which contains a function called from loop() that does the following:

Code: Select all    memset(&pkg, 0, sizeof(pkg));
    pkg.cmd = REQ_ID_STREAM_INFO;
    pkg.payload.stream_info.width = camera.width();
    pkg.payload.stream_info.height = camera.height();
    Udp.beginPacket(ctx->ip, ctx->port);
    Udp.write((uint8_t *)&pkg, sizeof(pkg));
    Udp.endPacket();
     
             
    // frame proper
    memset(&pkg, 0, sizeof(pkg));
    pkg.cmd = REQ_ID_STREAM_FRAME;
    pkg.payload.frame_size = camera.frameSize();
    Udp.beginPacket(ctx->ip, ctx->port);
    Udp.write((uint8_t *)&pkg, sizeof(pkg));
    Udp.write(camera.raw(), 30);//camera.frameSize());
    Udp.endPacket(); // OCCASIONAL FAILURE HERE


The last line occasionally fails.

I've noticed it doesn't fail when I reduce the number of bytes written to the second frame or when I introduce a delay between two packets.

Should it be like that or is it just a coincidence?

Can I check somehow that the packet has been sent and I can feed Udp more data? Should I do it?

I'm using WEMOS D1 Mini Lite based on ESP8285, WiFi client mode.