I got me a E28-2G4M12S (should use a SX1280 = 2400ISM Lora) and I wonder if one got it to work
towards an ESP32. I wonder about the wiring in between the ESP32 and the E28-2G4M12S.
My plan is to use Arduino, and here and if there are any libraries which can be used and if one has some sample code to get it to work with the TTN open source version (I have a 2.4ghz gw here).
I found this library GitHub - StuartsProjects/SX12XX-LoRa: Library for SX12XX LoRa devices but I am not sure if/how it can be used to connect to TTN. But maybe there are alternatives.
For now it is ājustā to have a learning experience. So if one sees to build an different 2.4ghz self made
node and has hardware / software suggestions, please let me know.
Stuartās library is for LoRa point to point. And very useful it is too. But you need a LoRaWAN stack that can use an SX1280 for the radio. The Semtech reference code, LoRaMAC-node, does not have support for SX1280. So youāll have to integrate one in to the other.
There is cutting edge, there is bleeding edge and there is randomly thrashing about in the dark. LoRaWAN on 2.4GHz is the latter.
There is an option under TTS using the Draft 2 implementation using 3 channelsā¦ not sure if viable on TTS(CE) - TTN.
SMTC are working closely with a few key lead customers for 2.4Ghz global logistcs chain and equiment monitoring for initial 2.4Ghz development and deployment - e.g. the maritime industry for shipping (moniting vessels and for cargo use. (Note including use with TTI support - see prior TTConference sessions), large scale retail/warehousing, etc.
Some very early technology demos used 2.4GHz and also there were others where a small fpga/asic assit was used for a form of RDF/ToF p2p to assess distance between nodes (note not N-GW) using the early LoRa Development Kits based on the Eiger hand held unitsā¦
Personally would not attemp to jump into 2.4Ghz at this point unless you have engaged with SMTC and have their buy in and support, or atleast have a commercial engagement with TTI and their backing ($$'s!)/assistanceā¦do not yet see this a community/TTN effort Not least becauseā¦
2.4GHz LoRa does offer the potential benefit of being able to uplink and dowlink substantial amounts of data, since there are no real legal duty cycle limits in this band. The disadvantage is of course the range is reduced in practical devices by around a factor of 3.
However I cannot see TTI providing the necessary infrastructure needed to allow for more data on a free for all basis, no such thing as free really.
So in terms of āfreeā useage, 2.4Ghz LoRa probably has no particular advantage over 868Mhz.
And roam widely without frequency band changes or having to use different regional SKUās hence the interest from global players and logistics type use cases, such a shippingā¦still need to be careful with downlink duty cycle as deaf when downlinking so limited use if not to loose those high volume uplinks! if running simplex - will be interesting to see how duplex ref design(s) developsā¦
Higher data rate spec led to FLoRa - not the margerine brand but āFast LoRaā!
Reservations about individual efforts to port to other platforms aside, nice code, very readable, I donāt suppose youād like to lead a group effort to make a better stack?
Indeed - FLRC = Fast Long Range Communications giving 260k-1.3Mb/s raw data rate depending on coding and BW if I recall = the 3rd Modem in the 1280/81ā¦ the fpga/asic assist mentioned earlier also evolved (IIRC) into the IP behind the Ranging Engineā¦1280 only not 1281.
Yes FLRC, if it were ever used in something like TTN, and you need some monitoring tools there is a packet monitor for it in my library.
What is interesting about FLRC, is that at the same rate, 200kbps, that is the maximum rate for 2.4Ghz LoRa, FLRC mode is quoted as having 6dBm extra sensitivity, so twice the distance. One day soon I will check that out for real.
So there may be a mode that is longer distance then even LoRa.
Not looked at datasheets/drafts details on 2.4GHz for 3 or 4 years but IIRC it was a mix of some LoRa like and gMSK implementation that pushed up close to the Shannon limitā¦ā¦sure I have a graph on file somewhere that show the LoRa, FSK & FLRC behaviour wrt Shannon limit and bit rateā¦will dig it out Note also handles basic BTLE packets/framing IIRC which is useful for some blended applications Had a potential client project that could have used 2.4Ghz p2p or p2mp, a few years back but decided to hold off to see how 2.4GHz LoRaWAN might developā¦.but then C-19 came along and looks to killed the whole thing off still they decided to stay with <GHz LoRaWAN
Guess all getting a bit off topic now so will stop!ā¦.
Not least becauseā¦
if running simplex - will be interesting to see how duplex ref design(s) developsā¦
still they decided to stay with <GHz LoRaWAN 