#PYTHON SLEEP CODE#

#PYTHON SLEEP CODE#

If your MQTT client library is dependent on the current thread being able to continue running, then it may be that your first mqttc.publish call queues the message, but the code that actually sends it to the wire does not run for five seconds which may be more than an internal time out so that message gets tossed, undelivered. However, the way time.sleep works is that it slams the brakes on the current thread for the amount of time you requested. Chances are that time.sleep is in fact “working properly”, in the sense that it most likely is doing exactly what you asked it to do. The one thing that I see as problematic in your code is time.sleep. Without more details, it is hard to pinpoint an issue with any specificity. What is mqttc? Probably an MQTT client but where does it come from? How is it initialized? Which MQTT library you are using for it? Also it might help to know the values of MQTT_QOS and MQTT_RETAIN, as they make a difference in how messages are delivered.Īnd how do you observe what’s been published? In this tutorial, you will learn about the Python function sleep () that allows you to introduce a delay in the execution of your program. One of the popular functions among them is sleep(). Suppose we want to pause the program execution for few seconds to let the user read the instructions about the program’s next step. This function is handy if you want to pause your code between API calls, for example. Python Sleep Using the threading.Timer() Method In this tutorial, we will look into various methods to pause or suspend a program’s execution for a given amount of time in Python. Python has a module named time which provides several useful functions to handle time-related tasks. You can use Python’s sleep () function to add a time delay to your code. Mqttc.publish(MQTT_TOPIC_DEFOUT, payload='Defrost inactive', qos=MQTT_QOS, retain=MQTT_RETAIN) Python sleep() The sleep() function suspends (waits) execution of the current thread for a given number of seconds. The time. Essentially, as the name implies, it pauses your Python program. #time.sleep set to 5 seconds for testing purpose Pythons time module has a handy function called sleep (). Mqttc.publish(MQTT_TOPIC_DEFOUT, payload='Dripoff in progress', qos=MQTT_QOS, retain=MQTT_RETAIN) Mqttc.publish(MQTT_TOPIC_DEFOUT, payload='Defrosting in progress', qos=MQTT_QOS, retain=MQTT_RETAIN)Įlif message.topic = MQTT_TOPIC_DEFROST and message.payload = '0': This is my code: if message.topic = MONITOR_REFRESH:Įlif message.topic = MQTT_TOPIC_DEFROST and message.payload = '1': Im trying to get this to work using time.sleep, however the first message isn’t being sent, and after the set time in time.sleep it sends the second message.Ĭould someone tell me why this is happening? I don’t have very much experience writing Python. I want to send a MQTT message on a input state change, and some time after the input state change send another message to the same topic as the first message. I’m currently developing a cold storage monitoring system using a PiFace which communicates over MQTT. I'd appreciate any help fixing this issue.I’ve got a question. However, when I added a small time delay in the while loop, the output would either get stuck on a single value or take multiple seconds to reflect a change to the potentiometer. When I ran the following python script, it worked properly and the sensor values were printing out in my terminal. Val = analogRead(potPin) // read the value from the sensor Int val = 0 // variable to store the value coming from the sensor

The arduino is running the following code: int potPin = 3 // select the input pin for the potentiometer

I am attempting to control the position of my computer's cursor using a potentiometer hooked up to my arduino nano.