Client: Len   45 [RequestBypassToServer]
2D 00
23
6E 00 70 00  63 00 5F 00  32 00 36 00  38 00 34 00
33 00 37 00  39 00 39 00  30 00 5F 00  43 00 68 00
61 00 74 00  20 00 31 00  00 00

_command  = readS()