Theory of Operation

Raspbian configuration files are set so the Raspberry Pi (with dongles) boots as an access point with known ESSID, connected to a preselected wired or wireless upstream LAN.

configures static access point network.
(router) configures upstream wired connection.
(repeater) configures upstream wifi client.
Raspbian default configuration requires trimming.
starts access point support at boot.
configures access point.
configures dhcp and dns.
Static ip addresses.
Start access point.
Boot with access point.