13
votes
Accepted
Would RPI 3 serve as IoT server with MQTT?
A Raspberry Pi 3 is a pretty serious bit of kit when you think about it
Quad core Arm Cortex
1gb of RAM
a onboard GPU
That is a huge amount of memory, easily more than enough to run a MQTT broker ...
- 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
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
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 ...
- 1,968
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 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
Are there any all-in-one chipsets that support LoRaWAN and Sigfox?
The SX127x family of chips from Semtech are modems supporting both LoRa and (G)FSK modulations (including ultra-narrow band FSK). Coupled with a microcontroller implementing the relevant stack(s), ...
- 553
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
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
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 ...
- 7,453
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
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
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
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
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
How to link LoRaWAN Server with WSO2 IoT through MQTT
WSO2 IoT server itself can be used for your purpose without a problem. You don't need to integrate lorawan-server and use WSO2 server as a MQTT broker here.
I was able to successfully try out their ...
- 849
5
votes
LoRaWAN collision and demodulation
Lora’s spreading and frequency chirps provide some level of de-confliction, but it’s not perfect. Lora devices transmit randomly on their own schedule, so there’s always the possibility of collision. ...
5
votes
Accepted
LoRaWAN collision and demodulation
I am trying to answer all your questions one after the other below.
In what scenario is it possible that collision happens between two packets.
If at the location of the receiver the signal of two ...
- 802
5
votes
Accepted
LoRaWAN roaming for overlapping networks
LoRaWAN has a feature called "macro-diversity", which allows more than one GW to demodulate the same uplink frame (UL).
Multiple gateways receiving the same UL increases network resiliency ...
- 66
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
How to link LoRaWAN Server with WSO2 IoT through MQTT
Like stated in answer of your previous question How can I interface a LoraWan network with MQTT? about MQTT and LoraWan, one device can be member in both, but both sides do not have to know about ...
- 4,301
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
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
Accepted
Lo.RaWAN: Why a network server is needed?
It wouldn't be much of a Wide Area Network (WAN) if you just had a single gateway.
While you can certainly have nodes report into a single gateway, the more expansive schemes (for example, The Things ...
- 1,878
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
4
votes
The Things Network - Pricing
Yes it's free.
The idea is similar to the original Internet model, if you set up a gateway you allow others to use it as well and in return you can use other peoples gateways, that way the overall ...
- 12.4k
4
votes
Accepted
The Things Network AWS IoT integration
First of all, trying to launch the integration from an SSH session is a bad idea (it is missing environment variables among other things).
With the old version of the integration (before 2.0.11), we ...
- 171
4
votes
Is it a good option to send images over LoRa network?
I think your best bet at these distances is a GSM modem with a SIM card and a data plan with the cheapest available operator. You can connect the GSM modem to whatever device is taking pictures via a ...
4
votes
Accepted
(Re)Joining existing Lora-wan end-devices to another network server
Unfortunatelly, the LoRaWAN 1.0.x spec does not define any standard way for having end-devices rejoin the same or another LoRaWAN network and generate new session keys. This is a big operation issue. ...
- 802
Only top scored, non community-wiki answers of a minimum length are eligible