Q & A

This page will grow with questions from the mailing list and topics that come up regularly in our EVerest development life. It is always a good idea to have a look here when running into problems before asking for help via the mailing list.

Errors, warnings and Troubleshooting

Compiling with GNU compilers

Building EVerest, you might want to use a GNU compiler. Handing over the flag CMAKE_CXX_COMPILER to cmake lets you do that.

However, when using gcc, you might get errors about some unreferenced symbols or linking issues.

Solution is simple: Use g++ instead:

cmake -D CMAKE_CXX_COMPILER=g++

g++ will link std C++ files automatically (besides others) which gcc won’t do.

RPC communication timeout

In the Admin Panel, I sometimes get the following error when saving a config file:

Failed to save test_config Reason: RPC communication timeout to everest
controller process.

How can I solve this?

In this case, the Admin Panel timeouted while waiting for the response of the EVerest process trying to save the file.

The timeout is currently 2s.

The problem with your setup might be that running EVerest as well as running an UI session with a browser on one hardware is just too much for it. This can sometimes happen on Raspberry Pies, for example.

You may try to connect from a desktop PC to IP_OF_THE_RASPBERRY:8849. This way, the client-side processing of the Admin Panel javascript code gets offloaded from the Raspberry and it might be able to process the save faster.

Another hint for environments with very limited ressources is to fill in the workspace information into the yaml config manually without using the Admin Panel.

EVerest OCPP 2.0.1 setup

After successfully setting up EVerest and configured the libocpp module, I get errors about a failed websocket connection.

The libocpp module of EVerest operates - for now - as an OCPP client. You will need to choose a backend system capable of OCPP 2.0.1 (like SteVe for OCPP 1.6).

You may want to have a look at https://github.com/mobilityhouse/ocpp and implement message handlers to get the communication working. Or you can have a look at https://github.com/thoughtworks/maeve-csms. Note: This has not been officially tested by us.