Is it possible to send a short text message (max. 100 characters) to a large number of nodes (several thousand) at a moment? And if yes, what are the limits?
I know the part with the duty cycle and compliance, but at the end of the use case is maybe about one single message in a week or less.
Could LoRa and LoRaWAN be the right technology for this?
I want to be independent from the 3G-, 4G- and 5G-network. Additionally Sigfox as an alternative isn’t able to work with payloads bigger than 8 Bytes.
Not even close to possible really - apart from the fact that the packet size has to vary by transmission settings so for devices further from any gateways, they will be far less then 100, the transmissions are individually addressed and with Class A, only sent when a node uploads.
You could run your own servers, for Class B or C operations, but again, each message is individually addressed.
LoRaWAN is aimed at frequent / regular low power uplinks and the very occasional downlink.
Using LoRa you could create your own peer 2 peer protocol with a broadcast address that all devices could listen out for. Assuming they are powered all the time waiting for this weekly broadcast, but any discussion would be off-topic as this is TTN & LoRaWAN.
This isn’t a good fit for TTN, even in areas where the availability of wider bandwidth downlink channels means an individual message itself could fit.
If it is achievable at all depends on things like the power source available to the nodes. It’s very hard to make a battery powered device receive an infrequent broadcast at an unexpected time - you essentially have to have periodic traffic going one way or the other to keep things in coordination so that you only run the power hungry receiver at infrequent, agreed upon times. So now you’re no longer only doing one thing a week.
Anyway, that’s not really on topic here as this is the TTN forum.
, but thank you for these answers. This makes some topics more clear.