A story of field trips, delivery trucks, and wax seals
In Direct Download, the device translator (IPA) talks straight to the profile factory. The remote control centre just says "go get it!" and sends a secret activation code through the air. No QR codes, no cameras, no humans!
Sometimes the device can't reach the profile factory: maybe it's on a slow network. The eIM handles everything: fetches the profile, securely packages it, and delivers it. The device never talks to the factory at all: like having a friend pick up your parcel!
Instead of sending commands one at a time, the eIM bundles everything into a signed digital envelope: an eIM Package. It has a digital signature (like a wax seal), an anti-replay counter, and a list of actions. The chip checks the signature, verifies the counter, and executes every command inside.
Every package has a counter value that only goes up. The chip remembers the highest number it's seen. If a bad actor tries to replay an old package with a lower number, the chip says "Nope, I've already seen this!" and rejects it. The counter can go up to 8,388,607: enough for daily use over 28 years!
The anti-replay counter can go all the way up to 8,388,607: that's enough for 800 operations every single day for 28 years without running out. When it gets close to the limit, the manager is re-added with a fresh counter!
Learn the secret handshakes that keep robot communications safe!