MITM capture showed MikroTik sends all-zero TCP data streams.
Our server was setting packet[0]=0x07 (STATUS_MSG_TYPE), which
MikroTik rejected. TCP mode has no status headers — just raw
zero-filled data streams in both directions.
Fixed in both server and client TCP TX loops.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
