LAYER1_
Layer 1 header size (plaintext): magic(3) + encrypt(1) + msgType(2) + size(4) + sessionId(8) + startTime(4) = 22 bytes
Layer 1 header size (plaintext): magic(3) + encrypt(1) + msgType(2) + size(4) + sessionId(8) + startTime(4) = 22 bytes