Vraag

max number of uploads

  • 8 November 2018
  • 3 reacties
  • 746 keer bekeken

I am still with the KPN free test period testing an ITalks 1608. If I connect the sensor via serial cable it is obvious that I see within the terminal software each movement - but not all in the debugger section of the KP portal. As soon as I disconnect the serial cable and I connect the battery I do see detail from the sensor but only once each 10 min or so. Is this a limitation of the test period and will this be solved when I signup for an paid account? Thank you in advance for your feedback.

3 reacties

Reputatie 7
Badge +6
Hi @721-LoRa ,

No problem! I'm here to help! 😁

The question is whether it is really an issue. The LoRa network is initially not intended for solutions where data is constantly being sent. For the constant sending of data, other IoT platforms are more suitable. But the Duty Cycle is indeed also applies when you have a (paid) subscription.
Thank you for your respons. So this issue is the same if I change from the free test account to a paid account?
Reputatie 7
Badge +6
Hi @721-LoRa ,

The reason why the sensor shows the data once per 10 min is The Duty Cycle. In the topic Uplink and Downlink messages and the Duty Cycle you find below explanation:

The maximum number of messages per day is related to the fact that KPN operates the LoRa network in the unlicensed 868 MHz ISM band. The number of messages is limited due to the duty cycle and payload in combination with the quality offered by the network. The 868 MHz ISM band limits the use of a device to 1% of the time on air. LoRaWAN specifies that each time a message is send in one ISM subband, the device must wait the remaining time of the duty cycle in that band before resending. This means that a sensor sending a message which takes 1 second should be quiet for 99 seconds after that. The time on air itself is related to the message size and the distance to the gateway. The closer the end-device is to the gateway the higher the data rate (and the lower the Spreading Factor used in the LoRa modulation). While being very close to the gateway the time on air will be minimum (low modulation overhead) and maximum payload can be used, so more messages per day can be supported.

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