Is there any hardware which can consume connection from 3G/4G SIM, LAN Ethernet cable, existing low range WiFi and can provide it as wifi access point and LAN, both.
New WiFi from this hardware should have consistent access, regardless which underlying connectivity it uses. It would be better if it is portable.
I am currently using SoftAP mode of WN722N wifi USB adapter. It delivers internet(via WiFi) obtained from any source(3G/4G adapter/LAN/another WiFi). It creates bridged network.
If its not possible in single device, recommend me combination of devices, with minimum cost. I expect it to serve 5 to 10 devices.