Other Parts Discussed in Thread: WI-SUN
Maybe this is the wrong forum, so I'll be happy to be forwarded to somewhere that fits better.
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Given a topology, where we have a 434MHz RF system consisting of actors, sensors, keyfobs and concentrators (gateways).
The gateway, based on a Linux SoM plus a CC1120-434MHz sub-part, is used for key management, hosting a webbrowser, Ethernet, BLE, ...
But given that a topology (hospital, schools) won't fit into one 434MHz network due to distances, it will be neccessary to deploy multiple gateways.
Now customer expect that the system -regardless on the number of gateways- shows itself at one system, so connecting to a gateway via BLE / Ethernet plug/ WiFi they want to be able to control all gateways (and e.g. all window opener at once) deployed in that total system. We could certainly limit the number of gateways to <10.
Now we need to decide how to establish the intererconnect between gateways (cable is customer-no-go / same for joing a local WLAN):
- Full mesh with all the problems during deployment? Without having a stable bullet proof mesh OS (I know about e.g. Contiki, but its a toolkit, where nobody beside perhaps Adam really knows whats going on inside)? No chance for us to support in an industrial environment.
- Full mesh based on ready-to-use Mesh-modules? They have ~110dB link budget. How to to setup a topology in large buildings without spending dozens of repeater-mesh-modules?
- Narrowband IoT with 5G? Great link budget. But pretty new, don't want to be the first fool ;-) Needs a SIM card and always a working connection through a provider network to a cloud which then handles the MQTT messages. Lots of "if's" and customers don't like SIM cards
- CC1120-CC1190 tandem FEM on 868MHz with ~150dBm link budget? RF-wise interesting, but we need to develop all the media access / protocol stuff on our own - I've been through it in the past, this is not fun.
Maybe you guys have hints..?
thx!