0003530: Unconsistent buffer sizes

ID	Project	Category	View Status	Date Submitted	Last Update

0003530	10000-006: Mappings	Spec	public	2016-09-13 14:46	2016-09-13 15:33

Reporter	Thomas Merk	Assigned To	Jim Luth
Priority	normal	Severity	major	Reproducibility	have not tried
Status	closed	Resolution	no change required

Summary	0003530: Unconsistent buffer sizes
Description	In section "6.7 OPC UA Secure Conversation" it is stated: ... UASC requires a TransportProtocol buffer size that is at least 8196 bytes As well as in section "6.7.2 MessageChunk structure": ... The MessageChunkSize depends on the transport protocol but shall be at least 8196 bytes. However in section "7 Transport Protocols" - "7.1.2 Message structure" in Table 36 – OPC UA TCP Acknowledge Message" for both ReceiveBufferSize and SendBufferSize it is stated: ... This value shall be greater than 8 192 bytes. One thing is that there are two different numbers for the buffer size. The other is that at one place "at least" is written (i.e. ">=") and at the other "greater than" is written (i.e. ">"). I have no idea what is really meant, but 8192 byte (== 8kB) sounds more reasonable. Also a buffer size of 8kB or greater (">=") seems to be more likely. The new UA Ansi C stack evaluates the Acknowledge and closes the socket if the condition "<= 8192" is true. In case of any changes to the specification the ANSI C stack has to be adapted as well.
Tags	No tags attached.

Commit Version
Fix Due Date

Date Modified	Username	Field	Change
2016-09-13 14:46	Thomas Merk	New Issue
2016-09-13 15:31	Jim Luth	Relationship added	duplicate of 0003447
2016-09-13 15:33	Jim Luth	Note Added: 0007175
2016-09-13 15:33	Jim Luth	Status	new => closed
2016-09-13 15:33	Jim Luth	Assigned To	=> Jim Luth
2016-09-13 15:33	Jim Luth	Resolution	open => no change required

Jim Luth 2016-09-13 15:33 administrator ~0007175	This is a dup of an issue that was fixed in 1.04 and 1.03 Errata. If in needs code fixed then an issue should be added to GitHub.