P_PING_ACK
[P_PING_ACK] = "PingAck",
if (!err && (cmd == P_PING || cmd == P_PING_ACK))
return conn_send_command(connection, sock, P_PING_ACK, 0, NULL, 0);
[P_PING_ACK] = { 0, got_PingAck },
if (cmd == &ack_receiver_tbl[P_PING_ACK]) {