Fetching data for teltonika devices (NodeJS)

uzair

Hi, I am developing a project where I have to integrate flespi to retrieve the vehicles data. Now, the vehicle sensors are sending data to flespi every second, instead of making flespi push data every second, I am looking for something where I have to pull the data. The data I am looking for is based on specific event e.g. I need to get the data once a vehicle starts and until it stops. So a complete trip data.

So what will the ideal and perfect solution? If I subscribe to flespi MQTT channel, then I will have to process data every second and probably do a lot of filteration and calculations every second.

shal

Hi!

Use flespi analytics for this that will generate an interval for each tripe with all messages inside it and send to your server via MQTT: https://flespi.com/kb/analytics-basics

If you will have any difficulties with configuration of selectors (you need type=expression) or counters(you need type-message, method=each) please contact our team using chat button located in top-right corner of your flespi.io account.

uzair

I believe if thats what I will be retrieving from interval is not sufficient. Because I want in-between messages e.g. message containing data once a certain parameter has value 'HIGH', as well as all the messages until I receive certain parameter to be 'LOW' from the particular vehicles.

shal

uzair you need to use counter type=message, method=each and it will work for you.

uzair

shal I see, I have selected counters to be of type message and method each. What about selectors? How to configure that. And how will it know that when to start capturing the data and when to publish it?

The message from the device will be as follows when I need to start logging the data based on the level "HIGH".

{"start_stop": {"drive_id": "4a81f109-8fdf-4442b168_7", "level": "HIGH", "method": "AUTOMATIC"}, "ts": 1634263}

And after this message, it should capture all the data until it received a message from that device with level = low as below.

{"start_stop": {"drive_id": "4a81f109-8fdf-4442b168_7", "level": "LOW", "method": "AUTOMATIC"}, "ts": 1678335306}

So all the messages including these two messages and in-between is required. Based on this, what should be my configuration for selectors/counters etc.

P.S: What should be in the "name" field of a counter? any specific values or can be any string.

shal

uzair I think we had a chat with you yesterday in the helpbox. Please continue there if the proposed solution not works.

The selector that works in your case is of type=expression, method=onchange and expression is start_stop["level"]. It will generate interval on the each change of start_stop["level"] value.