Connections to my postfix+imap server are "blocked" (connection refused).
Turns out the portreserve system is broken... it blocks ports the mail server needs!

for daemon in portreserve clamd cyrus-imapd spamassassin amavisd postgrey postfix
do
/sbin/service $daemon stop
done
for daemon in postfix postgrey amavisd spamassassin cyrus-imapd clamd portreserve
do
/sbin/service $daemon start
done


#add a user (I choose pi)
sudo useradd -m -c "Pi Octoprint" pi
#Be sure to give him a password
sudo password pi
#make sure it's up to date
sudo apt-get update
#install python building tools
sudo apt-get install build-essential python-dev python-pip python-virtualenv

NOW you can start with the instructions https://github.com/foosel/OctoPrint
Specifically,

Kept seeing this error
badlogin: fairlane.fishparts.net [192.168.83.10] DIGEST-MD5 [SASL(-13): user not found: no secret in database]
When trying to login as janice.
Needed to add janice to the correct realm:
saslpasswd2 -c janice -u mail.fishparts.net
That did the trick.

Get the filter rules

Steps to update the sieve filter rules.

If you use the Linux shell very much, you find its history functions very useful. You can recall previous commands very easily, just using the arrow keys.
If you use the Workload Scheduler command-line interfaces, conman and composer, you really miss the history. Sure there's the redo command, but its editing capability is limited to the last command you typed.

$ sudo firewall-cmd --direct --add-rule ipv4 filter INPUT 0 -m state --state NEW -m udp -p udp --sport 5002 -j ACCEPT
success
$ sudo firewall-cmd --direct --add-rule ipv4 filter INPUT 0 -m state --state NEW -m udp -p udp --sport 5004 -j ACCEPT
success
$ sudo firewall-cmd --direct --add-rule ipv4 filter INPUT 0 -m state --state NEW -m udp -p udp --sport 65001 -j ACCEPT
success
$ sudo firewall-cmd --reload

Backup:
/usr/bin/mysqldump --user=dbuser --password=dbpass --host=localhost --add-drop-table dbname > backups/mydbdump.sql

Restore:
(if the db exist)
# mysql -u root -p[root_password] [database_name] < dumpfilename.sql

mysql -u root -ps3cre3t

mysql> create database dbname;
Query OK, 1 row affected (0.02 sec)

# mysql -u root -ps3cre3t db < /tmp/mydbdump.sql

Yuasa YT19BL-BS

It appears the 'beacon' is their service:
strings on beacon got a lot... what makes me feel this is their 'stuff':
could not read eth0 IPv4...
beacon.api.meetlima.com
/home/denis/lima/git/lima-wanserr-firmware/openwrt/staging

A quick look it appears that

This is the unpopulated set of through-hole pads on the daughter card near the RJ45 end of the card. With jtagulator connected