We have nodes to control street lights; is there any limitation for downlink messages? We will have 100 devices.
ChirpStack is a service that you run yourself, so it doesn’t have a “fair use policy”. It’s up to you to run your network in a way that’s reliable for your devices, gateways, etc.
And as noted, you’ll need to abide by any governmental limits on frequencies, airtime, and so on. These can be found in the LoRaWAN specs, among other places.
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You should refer to your local regulations. In my opinion, the LoRaWAN specification’s regional specification doesn’t necessarily tell you what you surely can/cannot do, as it appears to be meant to define some standardized channel plans. It’s also possible for channel plans to be used in countries that don’t match the name of the plan (e.g. Brazil can use AU915).
Of course, do consider designing the system to avoid sending more than necessary, as downlinks are “expensive”; there is only one channel for class C-styled downlinks. If transmitting on the same frequency, spreading factor and same time, a collision may result.
I believe that some gateways are also only capable of half-duplex.
The “fair-use” policy exists to prevent parties from hogging the network, and to comply with local regulations.
If your device supports multicasting, that may be a more efficient way of controlling them.
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