Add transaction IDs to messages and handle on the server

server/asn1/StudySystemProtocol.asn1

@@ -12,12 +12,17 @@ Session ::= SEQUENCE {
 	minutes INTEGER
 }
 
-Request ::= CHOICE {
+RequestBody ::= CHOICE {
 	ping [0] NULL,
 	listPrioritizedActivities [1] NULL,
 	logSession [2] Session
 }
 
+Request ::= SEQUENCE {
+	transactionId INTEGER,
+	body RequestBody
+}
+
 PrioritizedActivity ::= SEQUENCE {
 	subjectId INTEGER,
 	subjectName UTF8String,
@@ -31,10 +36,15 @@ Error ::= ENUMERATED {
 	serverError(2)
 }
 
-Response ::= CHOICE {
+ResponseBody ::= CHOICE {
 	error [0] Error,
 	ack [1] NULL,
 	prioritizedActivities [2] SEQUENCE OF PrioritizedActivity
 }
 
+Response ::= SEQUENCE {
+	transactionId INTEGER,
+	body ResponseBody
+}
+
 END