Software IoT opensource (consulting)

NO PLACEHOLDERS. Do not insert a placeholder: please read the project details carefully because here are all the details you need to make an accurate estimation. I need to identify, install, and configure open-source software that allows me to remotely manage IoT devices without using an MQTT network. Currently, I intend to manage control units that oversee already installed environmental sensors performing: • temperature monitoring • humidity detection • air quality measurement The connectivity currently available on the devices is based on FTP; the control units are equipped with a telephone SIM. The goal is to have a dashboard that allows for viewing device status, monitoring data flow from devices, performing tasks on devices (such as firmware updates), etc. Environment: Windows Server 2019. I am therefore seeking consultancy from an expert systems administrator who can: 1. recommend the open-source software best suited to the described requirements (as an alternative to Tailscale, which is being phased out); 2. define the minimum required architecture (servers, communication protocols, security, automation); 3. prepare a step-by-step guide for installation and initial configuration; 4. present a brief operations and maintenance plan. We found some products online, such as OpenRemote (https://github.com/openremote/openremote). I accept documentation in Italian or English. Solutions must be manageable solely on Windows systems, without Docker, VMs, or WSL. We have a local/private AI in place; we are happy to evaluate potential complementary solutions that leverage this AI for monitoring and security purposes.