It seems you do not have a space here (noted by a red underscore):
:2}}]'_$"http://192.168.2.xxx:yyyy
Therefore everything is going into the --data-binary option.
Technically the $ just after the space shouldn't be there either... but its not doing any harm.
So just thought this might be helpful for people still looking....
I did all this using the RLC-410
When logging into a ReoLink which chrome you can press ctrl+shift+i -> to get the inspector. Then click the network tab.
When you are interacting with settings on the camera (or I assume PTZ...