Implementation of a production line ala McDonald's, how to implement it?

Question

CRM

There is a task:
There is crm - a system in which production orders are formed. There are 3 production workshops in which the monitors should receive orders about the need to start manufacturing this or that order. Accordingly, a certain sensor of information about the acceptance of the order and its readiness, the signal itself should go back to the CRM.
CRM itself is in the cloud, the implementation of php + js. MySQL base.
It is quite possible to implement data updating at the operator due to ajax requests.
Question: in what language is it better to implement the interaction between the CRM and monitors in the workshop and how to take information about the readiness of this or that information from the workshop? I ask you to suggest a topic, implementation options, a reference to the study. Where to dig?
PS I would not really like to implement using 4 computers, since it is expensive, there are power outages, it takes a long time to turn it on every time, although it is possible to set up autorun when turned on and make a single switch.
Thank you.

Answer 1

barcode scanner
, for example, on a mobile or industrial scanner
in the same place - on mobile phones - and clients