Solution to ESP8266 PubSubClient Publish Delay Issue

I updated the power-meter project two days ago and planned to use PubSubClient library to connect to homeassistant

But when running the project, I found that esp8266 mqtt push is extremely unstable

I checked the mqtt server and the client that receives the message, but no problems were found.

I wrote a loop push using esp8266, which is also very stable, eliminating the problem of the board itself

for(int i = 1; i <= 100; i++){
    sprintf(message, "%d", i);
    client.publish(topic, message);
    yield();
    delay(500);
}

Code snippet:

void loop(){
    while(1){
        light1 = analogRead(A0);
        if(light1 > powerledPin_average){
            // led on
            timeA = micros();

            delay(300);
            break;
        }
        yield();
        client.loop();
    }
    

    time_light = timeA - timeB;

    power = 1. / powerledPin_rate * 1000 * 3600 * 1000000 / time_light;

    Serial.println(power);
    sprintf(message, "%f", power);
    client.publish(topic, message);

    delay(100); // 加入延时
}

I guess the last line of publish code is not processed in time and continues to loop.So add a delay after pushing the code, and the problem is solved.