C# sending huge and small data buffers by socket and TCP -

i want send huge buffers (from 100mb 1gb) of data tcp. solved dividing buffer smaller (approximately 1mb buffers) , sending socket.send(). each call of socket.send() method, send part of data (smaller buffer) packed in specific structure: [start byte(1b), timestamp(4b), command(4b), length of data(4b), data send(?b), crc(1b), end byte(1b)]. works fine, when 1 huge buffer sent specific port. when try send in same time buffer data (very small, e.g. 20 bytes) using same tcp port, tcp mixed data in buffers , it's not possible decode buffer more. 'start byte' , 'end byte' in buffer not useful find start , end of buffer, because it's probable these bytes appear in data.

edit: issue not affect order or ids between packages bytes in packages. @ beginning works fine , each buffer decoded properly. after while not possible decode buffer, because contains incorrect data. looks bytes in buffer moved or changed. fields @ beginning of buffer (timestamp, command, length) contain impossible values. when want length of sent data, e.g. value -1534501133 instead of 1048556 (1048556 correct maximum size of sent data in 1 package). happens randomly connected moment when smaller independent buffer sent. additional information is, smaller buffers sent repetitively using timers , problem happens in random moments. possible send whole data (e.g. 300 mb) without problem happens rarely.

i hope, described enough.

do have suggestions how avoid problem?

tag data unique id know data relates message. also, separate packet header packet payload.

so, first request [id][packettype][time][command][length][crc]

second [id][packettype][data]

you can match ids types of packet. packet type 'header' or 'payload', header contain meta data payload allowing make sure doesnt mixed other data.