request/response can't dumped to the console,only print "waiting for start, storing into connection"

[dunzhu678]

Hi dear maintainer,
I launch grpcdump like this "./grpcdump -i vethwepl4d3ead1 -p 5678 -proto-files deploy.proto -proto-path /home/george/protodir/ -assembly_debug_log -json " , then launch a grpc client and invoke a grpc call ,but request/response can't dumped to the console,only print "waiting for start, storing into connection".

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INFO[0000] Starting sniff ethernet packets at interface vethwepl4d3ead1 on port 5678
2023/01/19 09:33:42 ignoring useless packet
2023/01/19 09:33:42 ignoring useless packet
2023/01/19 09:33:43 ignoring useless packet
2023/01/19 09:33:43 ignoring useless packet
2023/01/19 09:33:43 ignoring useless packet
2023/01/19 09:33:43 ignoring useless packet
2023/01/19 09:33:46 [10.20.128.0->10.20.192.5 40607->5678] waiting for start, storing into connection
2023/01/19 09:33:46 ignoring useless packet
2023/01/19 09:33:46 [10.20.192.5->10.20.128.0 5678->40607] waiting for start, storing into connection
2023/01/19 09:33:46 [10.20.128.0->10.20.192.5 40607->5678] waiting for start, storing into connection
2023/01/19 09:33:46 [10.20.192.5->10.20.128.0 5678->40607] waiting for start, storing into connection
2023/01/19 09:33:46 [10.20.128.0->10.20.192.5 40607->5678] waiting for start, storing into connection
2023/01/19 09:33:46 ignoring useless packet
2023/01/19 09:33:57 ignoring useless packet
2023/01/19 09:33:57 ignoring useless packet
2023/01/19 09:33:58 ignoring useless packet
2023/01/19 09:33:58 ignoring useless packet
2023/01/19 09:33:58 ignoring useless packet
2023/01/19 09:33:58 ignoring useless packet