My Samsung SM-T350 Galaxy Tab A running 6.0.1 (BPI2) has two wifi radios (2.4GHz and 5GHz). I can view the radios (wlan0 and wlan1) in the console by using commands ifconfig -a or netstat. Is there an Android app that relays the active internet connection (in my case, wlan0 was connected and assigned an IP address) to the unused radio (wlan1 was not being used).
When my iPad was jailbroken, I commonly used MyWi (available on Cydia) to perform this function. MyWi would share whatever connection available on the first wifi radio (usually 2.4GHz) to the unused wifi radio, using WPA2 security and generating DCHP IP addresses for the connected devices. MyWi had more flexibility: if the iPad was connected using wlan0 (assigned a local IP address) and connected to a VPN (assigned a remote IP address), MyWi could either share the local connection (wlan0) or the remote connection (ppp) over the second radio wlan1. Or it could share the selected connection through USB or Bluetooth. There is also a Windows equivalent that works equally as well called Connectify.
I lost my iPad jailbreak due to a repair and I need to replace MyWi in the meantime. It seems this should be straightfoward on the Android.