Change in osmo-gsm-manuals[master]: GSUP: message category indicated by last two bits

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osmith gerrit-no-reply at lists.osmocom.org
Fri Feb 1 15:10:01 UTC 2019


osmith has uploaded this change for review. ( https://gerrit.osmocom.org/12778


Change subject: GSUP: message category indicated by last two bits
......................................................................

GSUP: message category indicated by last two bits

Make this part of the specification, so we can simplify libosmocore
code by knowing that error message is (request message | 0x000001).

Related: I46d9f2327791978710e2f90b4d28a3761d723d8f (libosmocore)
Change-Id: Iec1b4ce4b7d8eb157406f006e1c4241e8fba2cd6
---
M common/chapters/gsup.adoc
1 file changed, 13 insertions(+), 0 deletions(-)



  git pull ssh://gerrit.osmocom.org:29418/osmo-gsm-manuals refs/changes/78/12778/1

diff --git a/common/chapters/gsup.adoc b/common/chapters/gsup.adoc
index 673ed59..7a16e64 100644
--- a/common/chapters/gsup.adoc
+++ b/common/chapters/gsup.adoc
@@ -766,6 +766,19 @@
 |0x32|CHECK-IMEI Result
 |===
 
+The category of the message is indicated by the last two bits of the type.
+Request, Error and Result messages only differ in these last two bits, so it is
+trivial to transform them.
+
+[options="header",cols="20%,80%"]
+|===
+|Ending Bits|Message Category
+|00|Request
+|01|Error
+|10|Result
+|11|Other
+|===
+
 [[gsup-ie-ipaddr]]
 ==== IP Address
 

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Gerrit-Project: osmo-gsm-manuals
Gerrit-Branch: master
Gerrit-MessageType: newchange
Gerrit-Change-Id: Iec1b4ce4b7d8eb157406f006e1c4241e8fba2cd6
Gerrit-Change-Number: 12778
Gerrit-PatchSet: 1
Gerrit-Owner: osmith <osmith at sysmocom.de>
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