Parallel Lynx BMS: Show that Lynx BMS is waiting to connect to a parallel system

[ReinvdZee]

See this issue, we'd like to show that a Lynx BMS is waiting to connect to the system. Currently, the BMS summary just shows its Soc, voltage and current (0A, because its not connected).

Instead, the following should be displayed:

• Summary (device list entry): "Waiting" + voltage delta + threshold (formatting suggestions welcome)
• BMS state: "Waiting"

Paths ~~When the BMS is in the waiting state, the path /State will be 18, which is a new state dedicated for this situation. The voltage delta can be calculated from the physical BMS voltage and the parallel BMS voltage: Voltage delta = com.victronenergy.battery.lynxparallelx/Dc/0/Voltage - com.victronenergy.battery.socketcan_.../Dc/0/Voltage~~

And since its a delta, should we take the absolute value of it? @mpvader ?

The voltage threshold will be reported in the path /ParallelConnectThreshold, but this must be added to vecan, so the issue is currently blocked.

UPDATE

We've changed "Waiting" into "Pending" and made some more changes. See https://github.com/victronenergy/venus/issues/1283 and slack for the discussions.

A new state with value 18 is added to the BMS to represent this state. The implementation must be as follows:

When the path /State is 18:

• Set the "State" field to "Pending"
• Set the summary field to "Pending .
• Do not translate the "Pending" term on the summary. (Reason for this is to prevent overlap with the BMS name in case of long translations)
• Show the field "System voltage" in the device-page when /State is 18. This field contains the voltage of the parallel BMS. To find the parallel BMS the individual BMS is part of, use the /N2kDeviceInstance path to compose the parallel BMS service name: com.victronenergy.battery.lynxparallel<n2kdevice instance>. The path /Dc/0/Voltage gives the parallel BMS voltage.

Gui-v1 screenshots:

[mpvader]

A delta? I thought we were going to show the absolute values.

[ReinvdZee]

A delta? I thought we were going to show the absolute values.

In the meeting of 04-06, we decided to show the voltage delta + threshold on Gui-v2. On V1 we show the system voltage.

[ReinvdZee]

I've updated the original issue description and removed the blocked label.

@blammit @chriadam @DanielMcInnes

[DanielMcInnes]

Hi @ReinvdZee , I'm having trouble debugging my issue with the replay files you sent me. The 2 BMSes don't show up for me in gui-v2, the data for them is not published over mqtt. I think it will be easier to debug this issue on the 'Lynx smart BMS parallel - test setup' we were using last week, with a BMS in 'Pending' state. (On that cerbo, the 2 BMSes do show up for me via mqtt).