From af67fe3cfec5fc4aa2dba8bb23e7c61ce24a827e Mon Sep 17 00:00:00 2001
From: Joel Wetzell <jwetzell@yahoo.com>
Date: Sat, 7 Dec 2024 11:36:11 -0600
Subject: [PATCH] add sdt get sessions data decoding

---
 README.md                   | 16 ++++++++--------
 packages/acn/src/models.ts  |  6 +++++-
 packages/acn/src/pdu/sdt.ts |  8 +++++++-
 3 files changed, 20 insertions(+), 10 deletions(-)

diff --git a/README.md b/README.md
index 2b05d92..fa46500 100644
--- a/README.md
+++ b/README.md
@@ -5,22 +5,22 @@ not sure how far I will take this but messing around with E1.17 ACN protocol
 - rlp
 - sdt
   - vectors    
-    - [x] REL_WRAP
-    - [x] UNREL_WRAP
-    - [ ] CHANNEL_PARAMS
     - [x] JOIN
     - [x] JOIN_REFUSE
     - [x] JOIN_ACCEPT
-    - [ ] LEAVE
     - [x] LEAVING
+    - [ ] NAK
+    - [x] REL_WRAP
+    - [x] UNREL_WRAP
+    - [x] GET_SESSIONS
+    - [ ] SESSIONS
+    - [x] ACK
+    - [ ] CHANNEL_PARAMS
+    - [ ] LEAVE
     - [ ] CONNECT
     - [ ] CONNECT_ACCEPT
     - [ ] CONNECT_REFUSE
     - [ ] DISCONNECT
     - [ ] DISCONNECTING
-    - [x] ACK
-    - [ ] NAK
-    - [ ] GET_SESSIONS
-    - [ ] SESSIONS
 - dmp
 - ddl
diff --git a/packages/acn/src/models.ts b/packages/acn/src/models.ts
index 80fd115..addb466 100644
--- a/packages/acn/src/models.ts
+++ b/packages/acn/src/models.ts
@@ -111,10 +111,14 @@ export type SDTAckData = {
   reliableSequenceNumber: number;
 };
 
+export type SDTGetSessionsData = {
+  componentID: string;
+};
+
 export type SessionDataTransportPDU = {
   vector: SessionDataTransportVectors;
   // TODO(jwetzell): cleanup these types
-  data: SDTJoinData | SDTJoinAcceptData | SDTJoinRefuseData | SDTWrapperData | SDTAckData | SDTLeavingData | Uint8Array;
+  data: SDTJoinData | SDTJoinAcceptData | SDTJoinRefuseData | SDTWrapperData | SDTAckData | SDTLeavingData | SDTGetSessionsData | Uint8Array;
 };
 
 export type SDTClientBlock = {
diff --git a/packages/acn/src/pdu/sdt.ts b/packages/acn/src/pdu/sdt.ts
index 32c6a9b..02e2a34 100644
--- a/packages/acn/src/pdu/sdt.ts
+++ b/packages/acn/src/pdu/sdt.ts
@@ -1,6 +1,7 @@
 import {
   Protocols,
   SDTAckData,
+  SDTGetSessionsData,
   SDTJoinAcceptData,
   SDTJoinData,
   SDTJoinRefuseData,
@@ -124,7 +125,7 @@ function decodeClientBlock(bytes: Uint8Array) {
 function decodeData(
   vector: SessionDataTransportVectors,
   bytes: Uint8Array
-): SDTJoinData | SDTJoinAcceptData | SDTJoinRefuseData | SDTWrapperData | SDTAckData | SDTLeavingData | Uint8Array {
+): SDTJoinData | SDTJoinAcceptData | SDTJoinRefuseData | SDTWrapperData | SDTAckData | SDTLeavingData | SDTGetSessionsData | Uint8Array {
   const view = new DataView(bytes.buffer, bytes.byteOffset, bytes.byteLength);
   switch (vector) {
     case SessionDataTransportVectors.JOIN: {
@@ -209,6 +210,11 @@ function decodeData(
         reasonCode: view.getUint8(24),
       };
     }
+    case SessionDataTransportVectors.GET_SESSIONS: {
+      return {
+        componentID: toHex(bytes.subarray(0, 16))
+      }
+    }
     default:
       console.error(`unhandled SDT vector: ${vector}`);
       return bytes;