Deviation from OCPP specification

[agruenb]

First of all, thank you for the cool project. However I think I found a slight deviation from the OCPP 1.6 specification. Under 4.1.1. Synchronicity it says:

A Charge Point or Central System SHOULD NOT send a CALL message to the other party unless all the CALL messages it sent before have been responded to or have timed out.

So setting the callConcurrency on client or server to anything different from 1 would violate the spec.

I could see someone not as familiar with the spec increase this option to improve performance in a test environment. However in the wild a microcontroller might run into unforseen problems when receiving multiple messages.

But maybe I understood this wrong which could also be the case 😛

[mikuso]

Hi, thanks for the kind words. 😊

You are correct, a call concurrency above 1 is not allowed in the current versions OCPP, but I specifically wanted to allow the option to support concurrency so that this module could be more useful for other applications. Personally, I use this module for other IoT projects which are not related to EV charging, and this is very useful for that.

I think the best thing for me to do would be to add a note/warning in the readme advising against using a number above 1, as you are correct this can cause compatibility issues, race conditions, etc...

[ZOUHIR23]

Hello dear @mikuso

please I have a question about your solution when I do the test with a real charging station it can not connect via websocket communication I do not know is what because of localhost I use or something else if you want to help me
thank you in advance

[mikuso]

@ZOUHIR23 this is not related to this issue. Please do not continue to steer issues off-topic.

I would like to help you, but this is not the correct way to ask for help. Please open a new issue instead.

When you open your issue, please include more detail such as what make & model of charging station you are using, and details of how you have configured it (screenshots if possible). This would be a good starting point.

Thanks for your cooperation.