There are 2 ways: Either bring it to mumbai or keep in ahemdabad.
Bring to Mumbai then:
Priming the AP with a Controller and Configure H-REAP
If you want the AP to discover a controller from a remote network where CAPWAP discovery mechanisms are not available, you can use priming. This method enables you to specify the controller to which the AP should connect.
In order to prime an H-REAP-capable AP, connect the AP to the wired network at the main office. During its boot up, the H-REAP-capable AP first looks for an IP address for itself. Once it acquires an IP address through a DHCP server, it boots up and looks for a controller to perform the registration process.
Keep in Ahemdabad:
Read the HREAP Controller discovery section: DHCP option 43 is the only solution.