How to organize data transfer to a remote majordomo server from the raspberry serial port to which the arduino uno is connected?

Question

Arduino

I have an Arduino uno to which current sensors, levels and door opening sensors are connected. The Arduino UNO is connected to the Raspberry Pi3 B via the USB port and lights up as (ttyACM0). In the terminal window, I calmly accept the data. But I need to send them via the Internet to another computer on which the Majordomo server is installed - a smart home system. I thought to organize all this in python using MQTT, or maybe there are simpler solutions? Tell me how all this can be implemented, I will be grateful for any help. Internet searches only confused me. I thought to do all this by writing data from the serial port to a file and sending it to the cloud (the same Google drive), and from it on the server back up to the smart home system. But there is also no success, because knowledge in programming is negligible.