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 Post subject: Newbie questions
PostPosted: Wed Apr 26, 2017 7:36 am 

Joined: Wed Apr 26, 2017 6:47 am
Posts: 2
Hello all
I have met LoRa some days ago and I found it pretty interesting. I'm planning to deploy a private local network using LoRa but I'm so confused! I would appriciate if you help me through these questions:

1- What is the difference between a LoRa module and a LoRaWAN module practically?
2- Can a LoRaWAN gateway like IMST IC880A communicate with a LoRa module?
3- IMST IC880A specifications says that it has 8 channels. What is a channel? Does it mean that IMST IC880A supports 8 simultaneous connection? An SX1272 module has only one single channel, so it meas it only supports a single connection at a time?

And finally I'm planning to buy some SX1272 LoRa modules as end-devices and an IMST IC880A module for gateway. Is this scenario practical?

Thanks in advance


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 Post subject: Re: Newbie questions
PostPosted: Thu Apr 27, 2017 10:31 am 

Joined: Mon Sep 28, 2009 12:06 pm
Posts: 11366
Hello xubin,
Quote:
1- What is the difference between a LoRa module and a LoRaWAN module practically?

We recommed to take a view to our documentation in:
http://www.libelium.com/development/was ... networking
http://www.libelium.com/downloads/docum ... -guide.pdf
http://www.libelium.com/downloads/docum ... _guide.pdf
http://www.libelium.com/development/was ... s-lorawan/

Quote:
2- Can a LoRaWAN gateway like IMST IC880A communicate with a LoRa module?

We have never used this gateway.

Quote:
3- IMST IC880A specifications says that it has 8 channels. What is a channel? [..]

All information about LoRa channels are defined in LoRa Specifications provided by LoRa Alliance:
https://www.lora-alliance.org/portals/0 ... %201R0.pdf

Eight channels of upstream allows communication eight simultaneous channels at same time.
LoRa modules only can send information over one channel at the same time.

Quote:
And finally I'm planning to buy some SX1272 LoRa modules as end-devices and an IMST IC880A module for gateway. Is this scenario practical?

It seems like it is possible but we do not handle the IMST IC880A, and we can not assert that it work. Consult your gateway manufacturer.
Regards


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 Post subject: Re: Newbie questions
PostPosted: Sun Apr 30, 2017 8:42 am 

Joined: Wed Apr 26, 2017 6:47 am
Posts: 2
Thanks for your reply.
Quote:
LoRa modules only can send information over one channel at the same time.

Don't you think that this may cause some problems? e.g. when more than one end-devices want to send data at a same time! What happens in this case?

Since WASPMOTE GATEWAY uses the same SX1272 chip as SX1272 LoRa module uses, I think it is possible to use SX1272 LoRa module for both gateway and end-device. Gateway is connected to the an e.g. RPi which which has access to the Internet and the end-device is connected to an e.g. Arduino. If this is possible, what are the advantages and disadvantages of this method?


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 Post subject: Re: Newbie questions
PostPosted: Tue May 02, 2017 8:02 am 

Joined: Mon Sep 28, 2009 12:06 pm
Posts: 11366
Hello xubin,
Quote:
Don't you think that this may cause some problems?

This is not a problem, it is a inherent limitation in LoRa SX1272.
Quote:
when more than one end-devices want to send data at a same time! What happens in this case?


If you want more than one end-devices will send data at same time you need a multichannel concentrator as gateway.

The SX1272 module in Waspmote is the same that CookingHacks.

You can use a SX1272 module as one channel concentrator by polling the end devices.

You must noticed that the time of transmission in LoRa protocol is rotatively sort so the occupation of the channel is equally short so you can share the channel.

All the information about the channel occupation is provided in the previously attached documentation.
Regards


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