fix: PeerExchange rpc decode in order not to take response's status_code mandatory - for support old protocol implementation #3059
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Description
lite-protocol-tester implementation started using PX from the receiver side and found that node that implements old style PeerExchange protocol does not containing status_code and status_desc can cause decode failure.
To handle this false assumption of making status_code for response mandatory, if not included the value is derived from the response enr list length.
+1
I found that PeerExchange tries to aggressively fill the ENR cache at startup. It takes a minimum 60 Peers to fill in the cache. But if there is not many this loop will run - async - till end of program at every 5.secs, instead of running at every 10 minutes as designed.
So to break the loop I added a max 10 times trial of aggressive filling.
Changes