There should not only be point-to-point connections. Each device should talk to each device.
So a package contains:

• node-address; 1B (Section)
• Package-ID

(Device needs to send broadcasts periodically to advertise itself.)
Device needs to send broadcasts at start to reset current package-id.

Implementation 1¶

Address filtering is not enabled in the device.
When sending an package, it is only send to broadcast address a single time but is stored in the transmit-list for each target section.
When a resend is necessary, it only sends the package to the section address.
Acknowledges are only send to the package source section.

• The latest package-id is tracked for each section. The entries in the send-list contain a bit-mask for the sections
• The entries in the send-list contains a single retry-counter. When a retry-count is exceeded, al sections in the mask are affected.

Syncing on restart of single Section¶

• Single sections should be disconnectable
• Nodes have to track existing sections.
• How does new node introduce?
• On power-on all sections are enabled. The device sends intro-packages to all sections. If large retry-count do not pass, sections get disabled.