It looks like this is your problem
"no devices on gateway"
I looked at lab cases, and found this:
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DP 7.03 uses an upgraded Catalyst version (v5), which is not compatible with previous versions.
StoreOnceSoftware (SOS) servers, gateways and cell manager must be patched to DP 7.03, other they will not be inter-operable.
SOS services must be restarted after applying 7.03.