Did you try tshark?
There is no such thing as “emoncms on the ESP8266” - emoncms is the software running on the Pi.
Do you mean there is nothing in the emoncms log for that ESP8266?
Please put 3 backticks on a line befoe and after any code, logs etc.
Is this when the inputs stopped?
Something odd there.
The error seems to appear at 04:00 every day. What happens then?
Might be unrelated…
No, Emonhub is something that runs under Raspbian - you would either first flash Raspbian and then use the emonScripts or simply use an EmonSD - a full emoncms will not hurt - just ignore it although it makes it easy to modify the emonhub config.
I suggest you just point the HTTP interface to your EmonPi in the emonhub config.
I’ve recently done it - look at this thread.
Yes.