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How to know if my device adhers to fair use?

  • 19 December 2017
  • 6 reacties
  • 389 keer bekeken
Dion Leurink
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Hello,

I need to send about 300 bytes each hour, with the limit of 51 bytes per frame this can't go in one go.
Now I will need to send about 6 * 64 frames.
This comes down to a full sized request every 10 minutes.

Does this adhere to the fair use policy (0.5s in the air) and how can i calculate this?
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Beste antwoord door Lennart Nordin 19 December 2017, 15:13

Bekijk origineel

6 reacties

Lennart Nordin
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Hi Dion,

Welcome to the KPN LoRa forum and thank you for your question.

There is an online tool available for calculating the airtime (and the duty cycle) of a LoRa message, based on several relevant parameters. This tool can be found here.

Does this answer your question?
Dion Leurink
Reputatie 2
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Thanks, ill figure out the values from the datasheet - and now I have all I need. Thanks!
Dion Leurink
Reputatie 2
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So in theory - if we had unlimitedly sized frames - the maximum would be a payload of 391. This would result in airtime of 599.30 ms, just bairly falling under the 0.6 s each hour.

I need to send about 300 bytes p/h so i can send 6 frames of 50 bytes, since that would result in 97.54 ms airtime * 6 uplinks = 585,24 ms airtime or 0.59s airtime. I dearly hope the header is not included in the calculation? Is my math right?
Tim
Reputatie 7
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I need to send about 300 bytes p/h so i can send 6 frames of 50 bytes, since that would result in 97.54 ms airtime * 6 uplinks = 585,24 ms airtime or 0.59s airtime. I dearly hope the header is not included in the calculation? Is my math right?
Hi Dion, from my understanding you got that right. The payload (data) can hold max 51 bytes and doesn't include the metadata (header) size. So you are able to use all 51 bytes for your payload data.
Met vriendelijke groet, Tim | - Blij met een reactie? Met een Like geeft u waardering! -
Dion Leurink
Reputatie 2
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I need to send about 300 bytes p/h so i can send 6 frames of 50 bytes, since that would result in 97.54 ms airtime * 6 uplinks = 585,24 ms airtime or 0.59s airtime. I dearly hope the header is not included in the calculation? Is my math right?
Hi Dion, from my understanding you got that right. The payload (data) can hold max 51 bytes and doesn't include the metadata (header) size. So you are able to use all 51 bytes for your payload data.

Sweet.
De vraag in het engels gesteld, dan hebben meer mensen er wat aan, maar nu ik u toch heb; ik zoek nog een afstudeerstage (richting embedded systems) en ben inmiddels wel fan van LoRa aan het worden.
Heb je een idee of ik daar iemand over kan spreken of kunt u me daar aan helpen?
#durftevragen
Lennart Nordin
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Hi Dion,

Leuk dat je enthousiast bent over LoRa! Als je mij een persoonlijk bericht stuurt met je studieachtergrond en waarnaar je precies op zoek bent in je opdracht dan kunnen we vanaf daar samen verder kijken wat er mogelijk is.

Groet,
Lennart

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