diff --git a/CHANGELOG.md b/CHANGELOG.md
index 70417a4d..d0249e8c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,3 +2,12 @@
 
 ## 0.1.0
 Initial release.
+
+## 0.1.1
+Refactoring.
+
+## 0.1.2
+Refactoring.
+
+## 0.1.3
+Refactoring.
\ No newline at end of file
diff --git a/lib/rsmp/proxy.rb b/lib/rsmp/proxy.rb
index 19c0b2fc..8a208e38 100644
--- a/lib/rsmp/proxy.rb
+++ b/lib/rsmp/proxy.rb
@@ -170,7 +170,7 @@ def check_ack_timeout now
       @awaiting_acknowledgement.clone.each_pair do |m_id, message|
         latest = message.timestamp + timeout
         if now > latest
-          log "No acknowledgements for #{message.type} within #{timeout} seconds", level: :error
+          log "No acknowledgements for #{message.type} #{message.m_id_short} within #{timeout} seconds", level: :error
           stop
           return true
         end
@@ -359,7 +359,7 @@ def send_version rsmp_versions
       version_response = Version.new({
         "RSMP"=>versions_hash,
         "siteId"=>[{"sId"=>@settings["site_id"]}],
-        "SXL"=>"1.1"
+        "SXL"=>@settings["sxl_version"]
       })
       send_message version_response
     end
diff --git a/lib/rsmp/site.rb b/lib/rsmp/site.rb
index 7bfc2a9f..8fd631e9 100644
--- a/lib/rsmp/site.rb
+++ b/lib/rsmp/site.rb
@@ -27,6 +27,7 @@ def handle_site_settings options
           { 'ip' => '127.0.0.1', 'port' => 12111 }
         ],
         'rsmp_versions' => ['3.1.1','3.1.2','3.1.3','3.1.4'],
+        'sxl_version' => '1.0.7',
         'timer_interval' => 0.1,
         'watchdog_interval' => 1,
         'watchdog_timeout' => 2,
diff --git a/lib/rsmp/supervisor.rb b/lib/rsmp/supervisor.rb
index 1f3b5108..4d9dc274 100644
--- a/lib/rsmp/supervisor.rb
+++ b/lib/rsmp/supervisor.rb
@@ -22,6 +22,7 @@ def handle_supervisor_settings options
         'site_id' => 'RN+SU0001',
         'port' => 12111,
         'rsmp_versions' => ['3.1.1','3.1.2','3.1.3','3.1.4'],
+        'sxl_version' => '1.0.7',
         'timer_interval' => 0.1,
         'watchdog_interval' => 1,
         'watchdog_timeout' => 2,
diff --git a/spec/supervisor_spec.rb b/spec/supervisor_spec.rb
index 52fe9115..0751f79f 100644
--- a/spec/supervisor_spec.rb
+++ b/spec/supervisor_spec.rb
@@ -50,7 +50,7 @@
 	      protocol = Async::IO::Protocol::Line.new(stream,RSMP::WRAPPING_DELIMITER) # rsmp messages are json terminated with a form-feed
 
 	      # write version message
-				protocol.write_lines '{"mType":"rSMsg","type":"Version","RSMP":[{"vers":"3.1.4"}],"siteId":[{"sId":"RN+SI0001"}],"SXL":"1.1","mId":"8db00f0a-4124-406f-b3f9-ceb0dbe4aeb6"}'
+				protocol.write_lines '{"mType":"rSMsg","type":"Version","RSMP":[{"vers":"3.1.4"}],"siteId":[{"sId":"RN+SI0001"}],"SXL":"1.0.7","mId":"8db00f0a-4124-406f-b3f9-ceb0dbe4aeb6"}'
 				# supervisor should see our tcp socket and create a proxy
 				proxy = supervisor.wait_for_site "RN+SI0001", 0.1
 				expect(proxy).to be_an(RSMP::SiteProxy)
@@ -66,7 +66,7 @@
 
 
 				version = JSON.parse protocol.read_line
-				expect(version).to eq({"RSMP"=>[{"vers"=>"3.1.4"}], "SXL"=>"1.1", "mId"=>"1b206e56-31be-4739-9164-3a24d47b0aa2", "mType"=>"rSMsg", "siteId"=>[{"sId"=>"RN+SU0001"}], "type"=>"Version"})
+				expect(version).to eq({"RSMP"=>[{"vers"=>"3.1.4"}], "SXL"=>"1.0.7", "mId"=>"1b206e56-31be-4739-9164-3a24d47b0aa2", "mType"=>"rSMsg", "siteId"=>[{"sId"=>"RN+SU0001"}], "type"=>"Version"})
 
 				protocol.write_lines JSON.generate("mType"=>"rSMsg","type"=>"MessageAck","oMId"=>version["mId"],"mId"=>SecureRandom.uuid())
 				expect {