Never should be remotely controllable in the first place
Heavy machinery, especially something that if mishandled can kill hundreds, is not something that should be fully-controlled by software. Especially since everyday I am constantly reminded that no matter how well made the software is, it will still screw up in new and interesting ways. And the fact that something like this, which require real-time communication and numerous fail safes, which TCP/IP over a 802.11 is entirely unsuitable for. Like what actions would the crane take if the network gets flooded and commands are being delayed or dropped? Like what if the crane was last commanded to rotate but the command to stop is lost? What if there is a delay and the operator repeats a command, does the crane do it twice or should it assume the operator only sent two under the assumption the first never made it?
I wouldn't have a problem if it had a human manually operating the controls but guided by software, at least then there is human doing the actual control work and can refuse to do dangerous operations. Like I can understand having a remote control unit that would allow someone o the ground direct the crane's actions, but that should really be instructions sent to a human operator. Like you'd have an assistant to the operator on the ground with a device that sends a video feed and to the operator and allows them to send preset commands that show up on the operator's control panel (Like green arrows of varying lengths for move a little to the right, move a lot to the left, lift the load a meter, lower a few centimeters, stop, etc.