11
votes
Accepted
How can I interface a LoraWan network with MQTT?
Imagine your network as a Venn diagram where one set is LoraWan and the other is MQTT.
Elements in the sets should know only about their set(s).
So nodes using LoraWan (are in the LoraWan set) do ...
- 7,463
11
votes
Configuring LoraWan Gateway
In a typical LoRaWAN network, gateways are dumb devices, as explained by the LoRa Alliance:
LoRaWAN network architecture is typically laid out in a star-of-stars topology in which gateways is a ...
- 534
9
votes
MTAC-LORA-H-868: Can I use without an antenna?
These are mainly very general answers that apply to all receiver/transmitters not just the LoRa gateway.
As a rule you should not run transmitters with out an antenna attached (or a dummy load) as ...
- 12.4k
9
votes
LoRa - Creating a personal network to track cars
Yes, using LoRa radios to receive messages is possible. For the Arduino platform, the LMIC library can be used. See my code for mobile node with gps and gateway. The gateway publishes data to a ...
- 238
8
votes
Accepted
Is Bluetooth a good enough protocol for "lost my keys" beacons?
The problem is essentially one of receivers and of power.
A "find my keys" type of beacon needs to be small enough to attach to your keychain and you probably don't want to have to regularly ...
- 386
8
votes
Suitable wireless technologies for high density industrial IoT
Your challenge is handling the throughput demands with channel contention. Your devices are all close enough that you need to assume they are all potential interferers to each other so you will need ...
- 10.3k
8
votes
Accepted
Using LoRa as a www link
I think you missed how slow LoRa is. It is very, very, very, very slow.
The slowest data rate (at SF12, BW125) is just 250 bits per second. That's 31 bytes per second. Just the text of this answer ...
- 2,113
7
votes
Accepted
Is it possible to share an Application between two or more LoRa Gateways using TTN?
Indeed, the whole point of "The Things Network" (TTN) is that multiple LoRa gateways are used to transfer messages between LoRa radio signals and the Internet based routing.
And these don't even have ...
- 1,878
7
votes
Accepted
Is a range of 50 km+ possible in LoRa?
It seems that a range of at least 440 km is possible with the LoRa protocol (i.e. there is no time-of-flight assumption as in GSM).
The correct way to answer this question is by looking at the link ...
- 10.3k
7
votes
Accepted
RFM69W and LoraWan
Just to clarify from what I undestand when researching these modules:
RFM69x - Packet Radio (not LoRa)
RFM96x - LoRa Radio (or RFM95 / RFM97 - thanks Chris)
If you're trying to use an RF69x for ...
7
votes
Is Bluetooth a good enough protocol for "lost my keys" beacons?
This is an unusual use-case where the data throughput which you require is really low - range and low power are the driving factors. This points in the direction of a low data-rate, narrow band ...
- 10.3k
7
votes
Accepted
Can I connect my devices to the Cambridge Intelligent City Platform?
There doesn't appear to be a route for private individuals to get on the scheme, however, I have a company and live in Cambridge.
I can submit an application to http://www.connectingcambridgeshire....
- 1,215
7
votes
Accepted
What is the maximum Packet Size of a LoraWan including the phy headers
How big is a LoRa packet including PHY headers
I assume you mean MAC header? After some LoRa chip has demodulated the LoRa radio signals for you, it will give you the LoRa PHY payload. For a LoRaWAN ...
- 534
7
votes
Accepted
Is it a good option to send images over LoRa network?
Using the information in this answer: https://iot.stackexchange.com/a/2934/746
At (a worst case) max useable payload of 51bytes it will take 41,120 packets to send a single image (assuming no need ...
- 12.4k
6
votes
Is a range of 50 km+ possible in LoRa?
First, your question is unanswerable by the way as no one could tell what will work in an unknown environment. For example if there is a huge hill between the two modules, or a big city then it won't ...
- 7,463
6
votes
Accepted
Increasing the range of an RF module
The data sheet is not too forthcoming on their expectation for connecting an antenna (other than suggesting that a matching network is mandatory if you run high power). However, from the photos in the ...
- 10.3k
6
votes
Protocol for over 300 metres and minimum of 20 kbytes datarate?
I would recommend some sort of mesh network, as obviously plain old WiFi or BT won't cover those distances. Zigbee is as good a candidate as any.
For hardware, AdaFruit does some good wearables, ...
6
votes
Is Bluetooth a good enough protocol for "lost my keys" beacons?
I would like to say that Yes, Bluetooth is a good candidate for indoor positioning.
Depending on how good positioning you want, of course.
If you have Bluetooth beacons scattered over your house it ...
- 663
6
votes
Accepted
Arduino LMIC: Figuring out when packet transmission has been started on Chip
LMiC does not tell your code when transmission has started, but you could enable debug logging.
When you're transmitting well below duty cycle limitations, then LMiC will often send almost ...
- 534
6
votes
Accepted
Cannnot send from Arduino to Raspberry pi via LoRa
I figured it out.
Turns out there was a bug in the raspi_lora library I used for my python code.
It is so that, if you are not specifically sending to the device address or have receive_all=True, it ...
- 241
5
votes
Ultra Low Energy point-to-point protocol choice
As is often the case, it depends. There are many factors to consider, and a lot of options available to cover the many different use cases around.
Range
DigiKey suggest that you can expect the ...
- 18.1k
5
votes
Is there a way to create WiFi with one Access Point, which should cover a big building?
One Access Point for 250m2 and 3 floors, seems to stretch WiFi a bit.
It depends on the material in the building, surrounding interference and antenna.
To give a answer, one should do a survey and ...
- 772
5
votes
Accepted
Lo.Ra and Lo.RaWan: Why is a gateway needed?
can't I have "something" that receives the data and sends them over ip-based networks?
Yes you can and that's called a gateway.
https://www.lora-alliance.org/technology
https://www.thethingsnetwork....
- 104
5
votes
LoRaWAN Multicasting
On this site http://www.scoop.it/t/the-french-wireless-connection/p/4055120530/2015/11/12/lorawan-class-c-and-multicast there is link to presentation about a street lightning solution made with ...
- 4,301
5
votes
Accepted
Spreading Factor of LoRa
The sx1276-series chips don't support spreading factors outside of SF6-SF12 (per sx1276/77/78/79 datasheet). The new sx1262-series chips support SF5 (per sx1261/2 datasheet).
With lower spreading ...
- 211
5
votes
Accepted
What is wrong with this MQTT-SN bridge?
Baud rate
What I found remarkable is that while screen can get human readable characters, the
MQTT-SN bridge just seems to get garbage.
This turned out to be the important part of tracking down the ...
- 211
4
votes
MTAC-LORA-H-868: Can I use without an antenna?
Formally, you should indeed have a matched antenna when operating a radio transmitter, and antenna matching is indeed frequency dependent.
That said, (permissible unlicensed) LoRa RF power levels are ...
- 1,878
4
votes
LoRa - Creating a personal network to track cars
Yes, it is possible.
A common way to do this is to have a powered node that can receive data over LoRa and transmit it using ethernet or Wi-Fi to a cloud service. That means that whenever your mobile ...
- 663
4
votes
Is a range of 50 km+ possible in LoRa?
Try a Yagi antenna. Both receiver and transmitter will need an antenna, and they must be aligned with each other (direct line of sight). Just a few degrees of inaccuracy will cause bad reception. ...
- 469
4
votes
Accepted
Using television Yagi antenna on a public homemade LoraWan gateway
A Yagi (and most TV) antennas are VERY directional, they achieve their good range by making sure they direct all energy in one direction. You would only be able to communicate with devices that are on ...
- 12.4k
Only top scored, non community-wiki answers of a minimum length are eligible