englishm/zabbix_send — pull request #2 by ancheremukhin (2013-06-03 09:59:07+00:00)
Title: <DATALEN> in zabbix sender protocol is  64-bit unsigned, native endian

It will be more correct to use 64-bit unsigned, native endian for field.
see https://www.zabbix.com/documentation/1.8/protocols