conn: Remember the sequence number we expect as response and dispatch

This is lacking timeout and sanity checking. E.g. we want to make sure
we get a response within the next XYZ seconds and we want the system
to check that the response belongs to the request we sent.

connection/SMPPConnection.st

@@ -17,7 +17,7 @@
 "
 
 Osmo.OsmoStreamSocketBase subclass: SMPPConnection [
-    | writeQueue nextSeq systemId password systemType |
+    | writeQueue nextSeq systemId password systemType pendingCommands |
     <category: 'SMPP-Connection'>
 
     createConnection: aHostname port: aPort [
@@ -56,15 +56,19 @@ Osmo.OsmoStreamSocketBase subclass: SMPPConnection [
 
         self send: (SMPPMessage new
                     header: header;
-                    body: body)
+                    body: body) onResponse: [:resp | ].
     ]
 
-    send: aMessage [
-        | seq |
+    send: aMessage onResponse: aBlock [
+        | seq key |
         seq := nextSeq.
         nextSeq := nextSeq + 1.
 
         aMessage header sequenceNumber: seq.
+
+        "Remember that we want a response. TODO add timeout handling"
+        pendingCommands at: seq put: aBlock.
+
         writeQueue nextPut: aMessage toMessage asByteArray
     ]
 
@@ -72,6 +76,7 @@ Osmo.OsmoStreamSocketBase subclass: SMPPConnection [
         super connect.
         nextSeq := 1.
         writeQueue := SharedQueue new.
+        pendingCommands := Dictionary new.
         self scheduleBindTrx.
     ]
 
@@ -108,5 +113,13 @@ Osmo.OsmoStreamSocketBase subclass: SMPPConnection [
     ]
 
     receviedResponse: aMessage [
+        | seq block |
+	"Search for a response"
+        seq := aMessage header sequenceNumber.
+        block := pendingCommands removeKey: seq ifAbsent: [
+            "TODO: log it"
+            ^false].
+
+        block value: aMessage
     ]
 ]