Thank you Josef for valuable information!
Does Mender support a GUI frontend for the local FW update?
Hi @intern,
Support? Yes.
Provide? No.
Means, that if you need a local GUI, you need to construct something yourself and then invoke the Mender Client in standalone mode.
Greets,
Josef
Thank you Josef,
Where may I find the communication protocol to create my own server to control the client locally?
Hi @intern,
Standalone mode is exactly what the name suggests: you run the mender respectively mender-update binary with the install argument. No server whatsoever is needed. Find more on this in the documentation: Standalone deployment | Mender documentation
If you’re actually looking for a full custom server solution, then the API you need to implement is described at Mender API docs 
Greets,
Josef
Thank you Josef!
I appreciate quick and informative response.