The version can be found either using an Admin account and navigating to:
Dashboard -> Site administration -> Plugins -> Plugins overview -> BigBlueButtonBN
$plugin->version = 9999999999;
So, let's assume we have versions:
My old BBB plugins on Moodle 3.0.9:
1) mod_bigbluebuttonbn version 2015062101
The new BBB plugins that I wanted to use on Moodle 3.0.9:
1) mod_bigbluebuttonbn version 2016051919
Pre-installation steps:
a) I have the code in a git repository so if I need to, I can checkout the folders and revert the file changes.
b) It is important to keep a back up of the tables that the plugins use. From their "db/install.xml", there are two tables:
b.1) bigbluebuttonbn and bigbluebuttonbn_log for bigbluebuttonbn
c) I exported the tables one by one:
c.1) mysqldump -u MYUSERNAME -p MYDATABASE mdl_bigbluebuttonbn > /tmp/moodlelive_bigbluebuttonbn_table.sql
c.2) mysqldump -u MYUSERNAME -p MYDATABASE mdl_bigbluebuttonbn_log > /tmp/moodlelive_bigbluebuttonbnlog_table.sql
Upgrade steps:
a) rm -rf mod/bigbluebuttonbn
c) Then, I 'wget' and 'unzip' the zip files from the Moodle plugin directory, in my mod folder.
d) From the front-end, I followed the steps and upgraded the plugins.
Let's suppose that I am not happy with the new plugins; something does not work and I want to downgrade. At this stage, if I have created new meetings, they will be lost, if I apply the following steps, so please make sure that you only want to downgrade without migrating any "new" data.
Downgrade steps:
a) rm -rf mod/bigbluebuttonbn
b) git checkout -- mod/bigbluebuttonbn
At the moment, I have got the old plugin files that were stored in my GIT repository.
c) A table in the database keeps the new versions of the plugins that I installed. I must update these values otherwise Moodle will never use the older plugins versions and I will not be able to downgrade!
c.1) ID for mod_bigbluebuttonbn: select * from mdl_config_plugins where plugin = 'mod_bigbluebuttonbn';
c.3) update mdl_config_plugins set value = '2015062101' where id = THE_ID_FROM e.1;
c.4) update mdl_config_plugins set value = '2014070401' where id = THE_ID_FROM e.2;
d) So, up until now we have put in place the older versions in the database and we need to import the backups:
d.1) mysql -u MYUSERNAME -p MYDATABASE < /tmp/moodlelive_bigbluebuttonbn_table.sql
d.2) mysql -u MYUSERNAME -p MYDATABASE < /tmp/moodlelive_bigbluebuttonbnlog_table.sql
Refreshing the front-end will prompt you to update the database. Click on the button and then check if you can use the plugins - perhaps you will need to update the server and the URL of BBB server on the appropriate screen.