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Fix cellular dns test with IAR compiled binary #11220
Binary compiled with IAR crashes when trying to print null string. Fixed to print 'null' when the dns test is trying to print an empty ip address.
Pull request type
CellularContext now tries to get an IP address after connect and before sending NSAPI_STATUS_GLOBAL_UP. Even if we don't the IP address from the modem we will send NSAPI_STATUS_GLOBAL_UP and return success. Modem has an ip address but for some reason some modems don't give it to us.