AP+STA mode allows OpenWrt to connect to a wireless hotspot (AP) and provide wireless access from that hotspot to anything connected to the OpenWrt AP and Ethernet ports, the 'br-lan' device. This assumes that your OpenWrt device has the default settings where the AP and Ethernet port are bridged.
https://github.com/jordi-pujol/wwanHotspot/
https://github.com/jordi-pujol/wwanHotspot/wiki/Installation#install
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