Which Activation ABP or OTAA

[arjanvanb (Arjan)]

@NN3694

I should request the TTN for the DevAddr in advance and after that I flash my Node with final firmware

No, use OTAA:

@arjanvanb

For OTAA, each device needs an Application Identifier (AppEUI), Device Identifier (DevEUI) and secret Application Key (AppKey; not the secret application session key, AppSKey). With TTN, all these can be set to any value using TTN Console: each application can have multiple values for AppEUI, and for each node one can then select an AppEUI and manually enter the DevEUI and AppKey.

More details in Registration of node with pre-configured LoRaWAN keys - #2 by arjanvanb.

(And wondering if TTN ever considered providing some paid service to manufacturers to make it easy for a buyer to register such nodes, like through some QR code.)