Unable to start emonhub after restore of disk image

Emoncms Installation
1

I am running a very old version of OpenEnergyMonitor, and emonhub on a raspberry pi running Buster. Along with some other code that I have written, I’m using it as a thermostat for my boiler which is why I have not felt the need (or had the time) to update to the latest OS.

It has been working very well until just now, when the disk died. I have a disk image backup from a year ago (20 Feb 2025) and I re-installed that image on a new disk. Everything appears to be working except for emonhub.

I am running version 2.1.2 of emonhub (which I appreciate is very old now). A year ago, I attempted to upgrade, but could not get this to work, so I stuck with the old version. Update: After further examination I can see that emonhub.py contains the following “version = “emonHub emon-pi variant v2.1.2” but the version.txt shows 2.7.2 so I am a bit confused.

There is no entry in the emonhub log. Here is the extract from my syslog:

Feb 10 10:46:00 my-pi systemd[1]: Starting emonHub service description...
Feb 10 10:46:00 my-pi systemd[1]: Started emonHub service description.
Feb 10 10:46:02 my-pi emonhub.py[12075]: Traceback (most recent call last):
Feb 10 10:46:02 my-pi emonhub.py[12075]:   File "/usr/local/bin/emonhub/emonhub.py", line 35, in <module>
Feb 10 10:46:02 my-pi emonhub.py[12075]:     setattr(ehi,name,getattr(getattr(namespace,name),name))
Feb 10 10:46:02 my-pi emonhub.py[12075]: AttributeError: 'module' object has no attribute 'EmonHubTeslaPowerWallInterfacer'
Feb 10 10:46:02 my-pi systemd[1]: emonhub.service: Main process exited, code=exited, status=1/FAILURE
Feb 10 10:46:02 my-pi systemd[1]: emonhub.service: Failed with result 'exit-code'.

I have attempted to re-install, but with no success (i.e. I get the same error).

Typing python -V gives Python 2.7.16

Here is the service definition:

[Unit]
Description=emonHub service description
DefaultDependencies=no
Before=shutdown.target
Conflicts=shutdown.target
Requires=local-fs.target
After=sysinit.target syslog.target local-fs.target

[Service]
User=emonhub
PIDFile=/var/run/emonhub.pid
ExecStart=/usr/local/bin/emonhub/emonhub.py --config-file=/etc/emonhub/emonhub.conf --logfile=/var/log/emonhub/emonhub
.log
PermissionsStartOnly=true
ExecStartPre=/bin/mkdir -p /var/log/emonhub/
ExecStartPre=/bin/chgrp -R emonhub /var/log/emonhub/
ExecStartPre=/bin/chmod 775 /var/log/emonhub/
Type=simple
Restart=always

[Install]
WantedBy=multi-user.target

I appreciate that this is a very old system, but would be very grateful for some advice please (especially as I have no heating at the moment!).

2

I don’t know, but it looks like it is looking for an interfacer called EmonHubTeslaPowerWallInterfacer and isn’t finding it. The interfacers are files so is that one missing - a version mismatch?

3

Many thanks for your reply. I have finally got this running again - I’ve been battling with versions / environments. It is currently running with Python 3 and the emonhub log file reports that it is version 2.7.2 - which is puzzling because I can’t find that version in github?

Never mind - I know that one day I need to do a complete rebuild to get back on to current releases.

Thanks anyway.