rsl: Parse the full l3info with the GSM48MSG code

fakebts/RSLMsg.st

@@ -600,6 +600,11 @@ RSLInformationElement subclass: RSLAttributeData [
         <category: 'conversion'>
         ^ self
     ]
+
+    readStream [
+        <category: 'reading'>
+        ^ self data readStream
+    ]
 ]
 
 RSLAttributeData subclass: RSLChannelNumber [
@@ -773,6 +778,11 @@ RSLCommonChannelManagement subclass: RSLImmediateAssignment [
         <category: 'parsing'>
         ^ RSLMessageDefinitions immediateAssignCommandMessage
     ]
+
+    fullL3Info [
+        <category: 'accessing'>
+        ^ full_info
+    ]
 ]
 
 RSLMessageBase subclass: RSLTRXManagement [

fakebts/Test.st

@@ -430,7 +430,12 @@ RoundTripTestCase subclass: RSLRoundTripTest [
     ]
 
     testImmediateAssignment [
+        | rsl gsm |
         self roundtripTestFor: #immediateAssignmentData class: RSLImmediateAssignment.
+
+        rsl := RSLMessageBase parse: self immediateAssignmentData readStream.
+        gsm := OsmoGSM.GSM48MSG decode: (rsl fullL3Info readStream skip: 1; yourself).
+        self assert: gsm requestReference ra = 3.
     ]
 
     testChannelActivation [

fakebts/package.xml

@@ -2,6 +2,7 @@
     <name>FakeBTS</name>
     <namespace>FakeBTS</namespace>
     <prereq>OsmoNetwork</prereq>
+    <prereq>OsmoGSM</prereq>
 
     <filein>OMLMsg.st</filein>
     <filein>IPAOMLMsg.st</filein>