Send a length-prefixed frame: 4-byte BE header length, header bytes, 4-byte BE payload length, payload bytes. Both length prefixes are always present (payload length is zero when payload is empty; spec ยง12.2).
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| integer, | intent(in) | :: | fd | |||
| integer(kind=int8), | intent(in), | target | :: | header(:) | ||
| integer(kind=int8), | intent(in), | target | :: | payload(:) |