diff --git a/.github/workflows/pre_release.yml b/.github/workflows/pre_release.yml
index 23b31c353..67f914652 100644
--- a/.github/workflows/pre_release.yml
+++ b/.github/workflows/pre_release.yml
@@ -36,6 +36,7 @@ jobs:
           yarn typesafe-i18n --no-watch
           sed -i "s/= 'pl'/= 'en'/" ./src/i18n/i18n-util.ts
           yarn build
+          yarn webUI
 
       - name: Build firmware
         run: |
diff --git a/.github/workflows/tagged_release.yml b/.github/workflows/tagged_release.yml
index 48039c5ed..edca1c8ae 100644
--- a/.github/workflows/tagged_release.yml
+++ b/.github/workflows/tagged_release.yml
@@ -31,6 +31,7 @@ jobs:
           yarn typesafe-i18n --no-watch
           sed -i "s/= 'pl'/= 'en'/" ./src/i18n/i18n-util.ts
           yarn build
+          yarn webUI
 
       - name: Build firmware
         run: |
diff --git a/.github/workflows/test_release.yml b/.github/workflows/test_release.yml
index 1ae127f97..69467540e 100644
--- a/.github/workflows/test_release.yml
+++ b/.github/workflows/test_release.yml
@@ -36,6 +36,7 @@ jobs:
           yarn typesafe-i18n --no-watch
           sed -i "s/= 'pl'/= 'en'/" ./src/i18n/i18n-util.ts
           yarn build
+          yarn webUI
 
       - name: Build firmware
         run: |
diff --git a/interface/package.json b/interface/package.json
index 1cd151834..d1cf7aa20 100644
--- a/interface/package.json
+++ b/interface/package.json
@@ -33,7 +33,6 @@
     "@types/react-router-dom": "^5.3.3",
     "alova": "^2.13.1",
     "async-validator": "^4.2.5",
-    "dev": "^0.1.3",
     "history": "^5.3.0",
     "jwt-decode": "^3.1.2",
     "lodash-es": "^4.17.21",
diff --git a/interface/yarn.lock b/interface/yarn.lock
index 32a31e1a5..01024701b 100644
--- a/interface/yarn.lock
+++ b/interface/yarn.lock
@@ -1538,7 +1538,6 @@ __metadata:
     alova: "npm:^2.13.1"
     async-validator: "npm:^4.2.5"
     concurrently: "npm:^8.2.1"
-    dev: "npm:^0.1.3"
     eslint: "npm:^8.51.0"
     eslint-config-airbnb: "npm:^19.0.4"
     eslint-config-airbnb-typescript: "npm:^17.1.0"
@@ -2001,15 +2000,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"bindings@npm:^1.3.1":
-  version: 1.5.0
-  resolution: "bindings@npm:1.5.0"
-  dependencies:
-    file-uri-to-path: "npm:1.0.0"
-  checksum: 593d5ae975ffba15fbbb4788fe5abd1e125afbab849ab967ab43691d27d6483751805d98cb92f7ac24a2439a8a8678cd0131c535d5d63de84e383b0ce2786133
-  languageName: node
-  linkType: hard
-
 "bl@npm:^1.0.0":
   version: 1.2.3
   resolution: "bl@npm:1.2.3"
@@ -2772,17 +2762,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"dev@npm:^0.1.3":
-  version: 0.1.3
-  resolution: "dev@npm:0.1.3"
-  dependencies:
-    inotify: "npm:>= 0.1.6"
-  bin:
-    node-dev: ./node-dev.sh
-  checksum: 48cdddfef366062db728cd2b57b9f2e56a83b1e3e1455a761e1bd4f883f0eaec96953b7296e67415d3002af0a33481c3aca23a1e7cda0fc5882d3809db792d5f
-  languageName: node
-  linkType: hard
-
 "dir-glob@npm:^3.0.1":
   version: 3.0.1
   resolution: "dir-glob@npm:3.0.1"
@@ -4019,13 +3998,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"file-uri-to-path@npm:1.0.0":
-  version: 1.0.0
-  resolution: "file-uri-to-path@npm:1.0.0"
-  checksum: b648580bdd893a008c92c7ecc96c3ee57a5e7b6c4c18a9a09b44fb5d36d79146f8e442578bc0e173dc027adf3987e254ba1dfd6e3ec998b7c282873010502144
-  languageName: node
-  linkType: hard
-
 "filename-reserved-regex@npm:^2.0.0":
   version: 2.0.0
   resolution: "filename-reserved-regex@npm:2.0.0"
@@ -4911,18 +4883,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"inotify@npm:>= 0.1.6":
-  version: 1.4.6
-  resolution: "inotify@npm:1.4.6"
-  dependencies:
-    bindings: "npm:^1.3.1"
-    nan: "npm:^2.12.1"
-    node-gyp: "npm:latest"
-  checksum: 6453def0e3a921562c2a26ed6268028ab96f02c546578b6d25dfc95ef044eeb0f9f30c8e84a67c910c172fb2039a037964c1a06b9e7c3791519b2782541a8c37
-  conditions: os=linux
-  languageName: node
-  linkType: hard
-
 "internal-slot@npm:^1.0.5":
   version: 1.0.5
   resolution: "internal-slot@npm:1.0.5"
@@ -6025,15 +5985,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"nan@npm:^2.12.1":
-  version: 2.18.0
-  resolution: "nan@npm:2.18.0"
-  dependencies:
-    node-gyp: "npm:latest"
-  checksum: 5520e22c64e2b5b495b1d765d6334c989b848bbe1502fec89c5857cabcc7f9f0474563377259e7574bff1c8a041d3b90e9ffa1f5e15502ffddee7b2550cc26a0
-  languageName: node
-  linkType: hard
-
 "nanoid@npm:^3.3.6":
   version: 3.3.6
   resolution: "nanoid@npm:3.3.6"
diff --git a/src/emsesp.cpp b/src/emsesp.cpp
index 94aff0b98..3e2a8982d 100644
--- a/src/emsesp.cpp
+++ b/src/emsesp.cpp
@@ -716,7 +716,6 @@ std::string EMSESP::pretty_telegram(std::shared_ptr<const Telegram> telegram) {
     uint8_t offset = telegram->offset;
 
     // find name for src and dest by looking up known devices
-
     std::string src_name("");
     std::string dest_name("");
     std::string type_name("");
diff --git a/src/telegram.h b/src/telegram.h
index 60805ab2c..2cd0f49d7 100644
--- a/src/telegram.h
+++ b/src/telegram.h
@@ -113,7 +113,8 @@ class Telegram {
         return (val != value);
     }
 
-    // read a value from a telegram. We always store the value, regardless if its garbage
+    // read a value from a telegram if its not out of bounds.
+    // Then we update the value, regardless if its garbage
     template <typename Value>
     // assuming negative numbers are stored as 2's-complement
     // https://medium.com/@LeeJulija/how-integers-are-stored-in-memory-using-twos-complement-5ba04d61a56c
@@ -124,7 +125,20 @@ class Telegram {
         uint8_t num_bytes = (!s) ? sizeof(Value) : s;
         // check for out of bounds, if so don't modify the value
         auto msg_size = (index - this->offset + num_bytes - 1);
+        // TODO remove
+        Serial.print(" index: ");
+        Serial.print(index);
+        Serial.print(" offset: ");
+        Serial.print(offset);
+        Serial.print(" index: ");
+        Serial.print(" message_length: ");
+        Serial.print(this->message_length);
+        Serial.print(" msg_size: ");
+        Serial.print(msg_size);
+        Serial.println();
+
         if ((index < this->offset) || (msg_size >= this->message_length) || (msg_size > EMS_MAX_TELEGRAM_MESSAGE_LENGTH)) {
+            Serial.println("Rejedcting!"); // TODO: remove
             return false;
         }
 
diff --git a/src/test/test.cpp b/src/test/test.cpp
index 3b932bc96..0ba654b85 100644
--- a/src/test/test.cpp
+++ b/src/test/test.cpp
@@ -74,6 +74,18 @@ bool Test::run_test(const char * command, int8_t id) {
 //
 #ifdef EMSESP_STANDALONE
 
+    if (strcmp(command, "heat_exchange") == 0) {
+        EMSESP::logger().info("Testing heating exchange...");
+
+        add_device(0x08, 219); // Greenstar HIU/Logamax kompakt WS170
+
+        // [emsesp] boiler(0x08) -W-> Me(0x0B), UBAMonitorFastPlus(0xE4), data: 00 01 35 00 00 00 00 00 00 00 00 80 00 00 00 00 00 00 00 80 00 (offset 6)
+        uart_telegram({0x08, 0x00, 0xE4, 0x00, //
+                       00,   01,   0x35, 00,   00, 00, 00, 00, 00, 00, 00, 0x80, 00, 00, 00, 00, 00, 00, 00, 0x80, 00});
+
+        return true;
+    }
+
     if (strcmp(command, "2thermostats") == 0) {
         EMSESP::logger().info("Testing with multiple thermostats...");
 
@@ -493,16 +505,24 @@ void Test::run_test(uuid::console::Shell & shell, const std::string & cmd, const
         shell.printfln("Testing RC310...");
         run_test("310");
         shell.invoke_command("show devices");
-        shell.invoke_command("show");
+        shell.invoke_command("show values");
         shell.invoke_command("call system publish");
         shell.invoke_command("show mqtt");
         ok = true;
     }
 
+    if (command == "heat_exchange") {
+        shell.printfln("Testing heat exchange...");
+        run_test("heat_exchange");
+        shell.invoke_command("show devices");
+        shell.invoke_command("show values");
+        ok = true;
+    }
+
     if (command == "2thermostats") {
         shell.printfln("Testing multiple thermostats...");
         run_test("2thermostats");
-        shell.invoke_command("show");
+        shell.invoke_command("show values");
         shell.invoke_command("show devices");
         ok = true;
     }
@@ -571,7 +591,7 @@ void Test::run_test(uuid::console::Shell & shell, const std::string & cmd, const
 
         run_test("boiler");
         shell.invoke_command("show devices");
-        shell.invoke_command("show");
+        shell.invoke_command("show values");
         shell.invoke_command("call boiler info");
         shell.invoke_command("call system publish");
 
@@ -610,7 +630,7 @@ void Test::run_test(uuid::console::Shell & shell, const std::string & cmd, const
         // HC1
         uart_telegram({0x90, 0x00, 0xFF, 0x00, 0x00, 0x6F, 0x01, 0x02, 0x00, 0xCF, 0x00, 0xE6});
 
-        shell.invoke_command("show");
+        shell.invoke_command("show values");
         shell.invoke_command("show devices");
         ok = true;
     }
@@ -653,7 +673,7 @@ void Test::run_test(uuid::console::Shell & shell, const std::string & cmd, const
         uart_telegram(
             {0x08, 0x0B, 0xC2, 0, 0x08, 0xAC, 00, 0x10, 0x31, 0x48, 0x30, 0x31, 0x15, 0x80, 0x95, 0x0B, 0x0E, 0x10, 0x38, 00, 0x7F, 0xFF, 0xFF, 0xFF});
 
-        // shell.invoke_command("show");
+        // shell.invoke_command("show values");
 
         ok = true;
     }
@@ -686,12 +706,12 @@ void Test::run_test(uuid::console::Shell & shell, const std::string & cmd, const
         // Mqtt::nested_format(0);
 
         emsesp::EMSESP::temperaturesensor_.test();
-        shell.invoke_command("show");
+        shell.invoke_command("show values");
         shell.invoke_command("call system publish");
 
         // rename
         EMSESP::temperaturesensor_.update("01-0203-0405-0607", "testtemperature", 2);
-        shell.invoke_command("show");
+        shell.invoke_command("show values");
         shell.invoke_command("call system publish");
         ok = true;
     }
@@ -704,14 +724,14 @@ void Test::run_test(uuid::console::Shell & shell, const std::string & cmd, const
         // Mqtt::nested_format(0);
 
         emsesp::EMSESP::analogsensor_.test();
-        shell.invoke_command("show");
+        shell.invoke_command("show values");
         // shell.invoke_command("call system publish");
         // shell.invoke_command("show mqtt");
 
         // rename
         // bool update(uint8_t id, const std::string & name, int16_t offset, float factor, uint8_t uom, uint8_t type);
         EMSESP::analogsensor_.update(36, "analogtest", 2, 0.7, 17, 1);
-        shell.invoke_command("show");
+        shell.invoke_command("show values");
         // shell.invoke_command("call system publish");
         ok = true;
     }
@@ -1174,7 +1194,7 @@ void Test::run_test(uuid::console::Shell & shell, const std::string & cmd, const
         shell.printfln("Testing adding a thermostat FW120...");
 
         run_test("thermostat");
-        shell.invoke_command("show");
+        shell.invoke_command("show values");
         shell.invoke_command("call system publish");
 
         EMSESP::mqtt_.incoming("ems-esp/thermostat_hc1", "heat");
@@ -1243,7 +1263,7 @@ void Test::run_test(uuid::console::Shell & shell, const std::string & cmd, const
 
         uart_telegram("30 00 FF 0A 02 6A 03"); // SM100 pump off  0
 
-        shell.invoke_command("show");
+        shell.invoke_command("show values");
         ok = true;
     }
 
@@ -1676,7 +1696,7 @@ void Test::run_test(uuid::console::Shell & shell, const std::string & cmd, const
         // check for error "No telegram type handler found for ID 0x255 (src 0x20)"
         uart_telegram({0xA0, 0x00, 0xFF, 0x00, 0x01, 0x55, 0x00, 0x1A});
 
-        shell.invoke_command("show");
+        shell.invoke_command("show values");
         shell.invoke_command("call mixer info");
         shell.invoke_command("call system publish");
         shell.invoke_command("show mqtt");
diff --git a/src/test/test.h b/src/test/test.h
index beb9d02ee..c9ba676ca 100644
--- a/src/test/test.h
+++ b/src/test/test.h
@@ -26,7 +26,7 @@
 
 namespace emsesp {
 
-#define EMSESP_DEBUG_DEFAULT "general"
+// #define EMSESP_DEBUG_DEFAULT "general"
 
 // #define EMSESP_DEBUG_DEFAULT "thermostat"
 // #define EMSESP_DEBUG_DEFAULT "solar"
@@ -56,6 +56,8 @@ namespace emsesp {
 // #define EMSESP_DEBUG_DEFAULT "memory"
 // #define EMSESP_DEBUG_DEFAULT "coldshot"
 // #define EMSESP_DEBUG_DEFAULT "custom_entities"
+#define EMSESP_DEBUG_DEFAULT "heat_exchange"
+
 
 class Test {
   public:
diff --git a/src/version.h b/src/version.h
index 0c6f5999a..72d6c2ace 100644
--- a/src/version.h
+++ b/src/version.h
@@ -1 +1 @@
-#define EMSESP_APP_VERSION "3.6.3-dev.2"
+#define EMSESP_APP_VERSION "3.6.3-dev.3"