send: {"id": 1, "method": "mining.subscribe", "params": ["equihashminer", null, "eu1-zcash.flypool.org", "3443"]}
09:40:10:536 4d8 send: {"id": 2, "method": "mining.authorize", "params": ["t1dn3KXy6mBi5TR1ifRwYse6JMgR2w7zUbr","x"]}
09:40:10:536 4d8 send: {"id": 5, "method": "mining.extranonce.subscribe", "params": []}
09:40:10:536 4d8 DevFee: ZEC: Stratum - Connected (eu1-zcash.flypool.org:3443)
......................................................................................
DevFee: ZEC: 10/18/17-09:40:13 - SHARE FOUND - (GPU 1)
09:40:13:172 4d8 send share: {"id": 4, "method": "mining.submit", "params": ["t1dn3KXy6mBi5TR1ifRwYse6JMgR2w7zUbr","aff439a5d1b69cd6cf1d","05f7e659","d40100000000000000000000000000000000000000000000000000","fd400500655b2453cb8ca5
09:40:13:266 4d8 got 23 bytes
09:40:13:266 4d8 buf: {"id":4,"result":true}
09:40:13:266 4d8 parse packet: 22
Not much different this is his devfee address from the log file.
EDIT there is a problem he is connecting to SSL port of flypool for the devfee, if the data is already encrypted(openssl) in the socket buffer your method may not work.