We need to deploy sensor to 50 residential properties, each property will gave up to 10 sensors/devices: - Power Meter (Volts, Amps, Power) - Relays (for switching on/off loads) This is a temporary trial so needs to be cost effective. After some research we are leaning towards: - Shelly Monitors, Smart Plugs and Relays in the properties using MQTT - Local 4G gateway installed to create a WiFi network - Data sent over a VPN network to a central server running Open Automation Software (OAS) and a MQTT Broker - Data sored in SQL Database in Azzure We need to prototype a instance of the above, and need help with: - MQTT Configuration (broker, client settings) - VPN Configuration (we use Teletonika gateways with their own OpenVPN service) - OAS Configuration - Security If the porotype can be quickly shown to work, will then need ongoing support to deliver the project.