diff --git a/apps/gtk-discover/main.c b/apps/gtk-discover/main.c
index a2ed7a97..c4bda8d2 100644
--- a/apps/gtk-discover/main.c
+++ b/apps/gtk-discover/main.c
@@ -78,7 +78,12 @@ enum {
 };
 
 enum {
+    PROPERTY_COL_DEVICE_ID,
+    PROPERTY_COL_OBJECT_TYPE,
+    PROPERTY_COL_OBJECT_ID,
     PROPERTY_COL_ID,
+    PROPERTY_COL_ARRAY_INDEX,
+    PROPERTY_COL_VALUE_TAG,
     PROPERTY_COL_NAME,
     PROPERTY_COL_VALUE,
     PROPERTY_NUM_COLS
@@ -254,6 +259,7 @@ static void add_discovered_properties_to_gui(
     GtkTreeIter iter;
     unsigned int property_count = 0;
     unsigned int index = 0;
+    uint32_t array_index = BACNET_ARRAY_ALL;
     uint32_t property_id = 0;
     BACNET_OBJECT_PROPERTY_VALUE object_value = { 0 };
     BACNET_APPLICATION_DATA_VALUE value = { 0 };
@@ -279,25 +285,31 @@ static void add_discovered_properties_to_gui(
             object_value.object_type = object_type;
             object_value.object_instance = object_instance;
             object_value.object_property = property_id;
-            object_value.array_index = BACNET_ARRAY_ALL;
+            object_value.array_index = array_index;
             object_value.value = &value;
             str_len = bacapp_snprintf_value(NULL, 0, &object_value);
             if (str_len > 0) {
                 char str[str_len + 1];
                 bacapp_snprintf_value(str, str_len + 1, &object_value);
                 gtk_list_store_set(
-                    property_store, &iter, PROPERTY_COL_ID, property_id,
-                    PROPERTY_COL_NAME, property_string, PROPERTY_COL_VALUE, str,
-                    -1);
+                    property_store, &iter, PROPERTY_COL_DEVICE_ID, device_id,
+                    PROPERTY_COL_OBJECT_TYPE, object_type,
+                    PROPERTY_COL_OBJECT_ID, object_instance, PROPERTY_COL_ID,
+                    property_id, PROPERTY_COL_ARRAY_INDEX, array_index,
+                    PROPERTY_COL_VALUE_TAG, value.tag, PROPERTY_COL_NAME,
+                    property_string, PROPERTY_COL_VALUE, str, -1);
             } else {
                 status = false;
             }
         }
         if (!status) {
             gtk_list_store_set(
-                property_store, &iter, PROPERTY_COL_ID, property_id,
-                PROPERTY_COL_NAME, property_string, PROPERTY_COL_VALUE, "-",
-                -1);
+                property_store, &iter, PROPERTY_COL_DEVICE_ID, device_id,
+                PROPERTY_COL_OBJECT_TYPE, object_type, PROPERTY_COL_OBJECT_ID,
+                object_instance, PROPERTY_COL_ID, property_id,
+                PROPERTY_COL_ARRAY_INDEX, array_index, PROPERTY_COL_VALUE_TAG,
+                value.tag, PROPERTY_COL_NAME, property_string,
+                PROPERTY_COL_VALUE, "-", -1);
         }
     }
 }
@@ -354,6 +366,98 @@ static void on_discover_devices_clicked(GtkButton *button, gpointer data)
     Send_WhoIs_Global(0, 4194303);
 }
 
+static void on_property_edited(
+    GtkCellRendererText *renderer,
+    gchar *path_string,
+    gchar *new_text,
+    gpointer user_data)
+{
+    GtkTreeModel *model = GTK_TREE_MODEL(user_data);
+    GtkTreeIter iter = { 0 };
+    guint device_id = 0;
+    guint object_type = 0;
+    guint object_id = 0;
+    guint property_id = 0;
+    guint array_index = 0;
+    long priority = BACNET_NO_PRIORITY;
+    guint value_tag = 0;
+    unsigned enumerated_value = 0;
+    bool status = false;
+    uint8_t invoke_id;
+    bool null_value = false;
+    BACNET_APPLICATION_DATA_VALUE value = { 0 };
+
+    (void)renderer; /* unused parameter */
+    if (gtk_tree_model_get_iter_from_string(model, &iter, path_string)) {
+        gtk_tree_model_get(
+            model, &iter, PROPERTY_COL_DEVICE_ID, &device_id, -1);
+        gtk_tree_model_get(
+            model, &iter, PROPERTY_COL_OBJECT_TYPE, &object_type, -1);
+        gtk_tree_model_get(
+            model, &iter, PROPERTY_COL_OBJECT_ID, &object_id, -1);
+        gtk_tree_model_get(
+            model, &iter, PROPERTY_COL_ARRAY_INDEX, &array_index, -1);
+        gtk_tree_model_get(
+            model, &iter, PROPERTY_COL_VALUE_TAG, &value_tag, -1);
+        gtk_tree_model_get(model, &iter, PROPERTY_COL_ID, &property_id, -1);
+        /* allow for optional priority using @ symbol for commandables */
+        if (property_list_commandable_member(object_type, property_id)) {
+            /* search the new_text for the @ symbol */
+            char *at_ptr = strchr(new_text, '@');
+            if (at_ptr) {
+                /* convert the priority value after the @ symbol
+                  into an integer */
+                priority = strtol(at_ptr + 1, NULL, 0);
+                if (priority < BACNET_MIN_PRIORITY) {
+                    priority = BACNET_NO_PRIORITY;
+                }
+                if (priority > BACNET_MAX_PRIORITY) {
+                    priority = BACNET_NO_PRIORITY;
+                }
+                /* null terminate the string at the @ symbol */
+                *at_ptr = 0;
+            }
+            /* check for case insensitive NULL string */
+            if (bacnet_strnicmp(new_text, "NULL", 4) == 0) {
+                null_value = true;
+            }
+        }
+        /* convert the string value into a tagged union value */
+        if (null_value) {
+            value.tag = BACNET_APPLICATION_TAG_NULL;
+            status = true;
+        } else if (value_tag == BACNET_APPLICATION_TAG_ENUMERATED) {
+            status = bactext_object_property_strtoul(
+                (BACNET_OBJECT_TYPE)object_type,
+                (BACNET_PROPERTY_ID)property_id, new_text, &enumerated_value);
+            if (status) {
+                value.tag = BACNET_APPLICATION_TAG_ENUMERATED;
+                value.type.Enumerated = (uint32_t)enumerated_value;
+            }
+        } else {
+            status = bacapp_parse_application_data(value_tag, new_text, &value);
+        }
+        printf(
+            "Parsed %s-%u %s %s -> tag=%u %s\n",
+            bactext_object_type_name(object_type), object_id,
+            bactext_property_name(property_id), new_text, value_tag,
+            status ? "successfully" : "unsuccessfully");
+        if (status) {
+            invoke_id = Send_Write_Property_Request(
+                device_id, object_type, object_id, property_id, &value,
+                priority, array_index);
+            if (invoke_id) {
+                printf(
+                    "WriteProperty to Device %u %s-%u %s = %s\n", device_id,
+                    bactext_object_type_name(object_type), object_id,
+                    bactext_property_name(property_id), new_text);
+                gtk_list_store_set(
+                    property_store, &iter, PROPERTY_COL_VALUE, new_text, -1);
+            }
+        }
+    }
+}
+
 /**
  * @brief Process discovered devices and add them to the GUI
  */
@@ -507,9 +611,14 @@ static void setup_property_tree_view(void)
 
     /* Create list store */
     property_store = gtk_list_store_new(
-        PROPERTY_NUM_COLS, G_TYPE_UINT, /* Property ID */
-        G_TYPE_STRING, /* Property Name */
-        G_TYPE_STRING); /* Property Value */
+        PROPERTY_NUM_COLS, G_TYPE_UINT, /* PROPERTY_COL_DEVICE_ID */
+        G_TYPE_UINT, /* PROPERTY_COL_OBJECT_TYPE */
+        G_TYPE_UINT, /* PROPERTY_COL_OBJECT_ID */
+        G_TYPE_UINT, /* PROPERTY_COL_ID */
+        G_TYPE_UINT, /* PROPERTY_COL_ARRAY_INDEX */
+        G_TYPE_INT, /* PROPERTY_COL_VALUE_TAG */
+        G_TYPE_STRING, /* PROPERTY_COL_NAME */
+        G_TYPE_STRING); /* PROPERTY_COL_VALUE */
 
     /* Create tree view */
     property_tree_view =
@@ -526,6 +635,10 @@ static void setup_property_tree_view(void)
     renderer = gtk_cell_renderer_text_new();
     column = gtk_tree_view_column_new_with_attributes(
         "Value", renderer, "text", PROPERTY_COL_VALUE, NULL);
+    g_object_set(renderer, "editable", TRUE, NULL);
+    g_signal_connect(
+        renderer, "edited", G_CALLBACK(on_property_edited),
+        GTK_TREE_MODEL(property_store));
     gtk_tree_view_append_column(GTK_TREE_VIEW(property_tree_view), column);
 }
 
diff --git a/src/bacnet/bactext.c b/src/bacnet/bactext.c
index 2c940230..3b2e469c 100644
--- a/src/bacnet/bactext.c
+++ b/src/bacnet/bactext.c
@@ -14,29 +14,47 @@
 static const char *ASHRAE_Reserved_String = "Reserved for Use by ASHRAE";
 static const char *Vendor_Proprietary_String = "Vendor Proprietary Value";
 
-/* Search for a text value first based on the corresponding text list, then by
- * attempting to convert to an integer value. */
-static bool bactext_strtol_index(
-    INDTEXT_DATA *istring, const char *search_name, unsigned *found_index)
+/**
+ * @brief Attempt to convert a numeric string into a unsigned long integer
+ * @param search_name - string to convert
+ * @param found_index - where to put the converted value
+ * @return true if converted and found_index is set
+ * @return false if not converted and found_index is not set
+ */
+bool bactext_strtoul(const char *search_name, unsigned *found_index)
 {
     char *endptr;
-    long value;
+    unsigned long value;
 
+    value = strtoul(search_name, &endptr, 0);
+    if (endptr == search_name) {
+        /* No digits found */
+        return false;
+    }
+    if (value == ULONG_MAX) {
+        /* If the correct value is outside the range of representable values,
+           {ULONG_MAX} shall be returned */
+        return false;
+    }
+    if (*endptr != '\0') {
+        /* Extra text found */
+        return false;
+    }
+    *found_index = (unsigned)value;
+
+    return true;
+}
+
+/* Search for a text value first based on the corresponding text list, then by
+ * attempting to convert to an integer value. */
+static bool bactext_strtoul_index(
+    INDTEXT_DATA *istring, const char *search_name, unsigned *found_index)
+{
     if (indtext_by_istring(istring, search_name, found_index) == true) {
         return true;
-    } else {
-        value = strtol(search_name, &endptr, 0);
-        if (endptr == search_name) {
-            /* No digits found */
-            return false;
-        } else if (*endptr != '\0') {
-            /* Extra text found */
-            return false;
-        } else {
-            *found_index = (unsigned)value;
-            return true;
-        }
     }
+
+    return bactext_strtoul(search_name, found_index);
 }
 
 INDTEXT_DATA bacnet_confirmed_service_names[] = {
@@ -252,7 +270,7 @@ bool bactext_object_type_index(const char *search_name, unsigned *found_index)
 
 bool bactext_object_type_strtol(const char *search_name, unsigned *found_index)
 {
-    return bactext_strtol_index(
+    return bactext_strtoul_index(
         bacnet_object_type_names, search_name, found_index);
 }
 
@@ -850,7 +868,7 @@ bool bactext_property_index(const char *search_name, unsigned *found_index)
 
 bool bactext_property_strtol(const char *search_name, unsigned *found_index)
 {
-    return bactext_strtol_index(
+    return bactext_strtoul_index(
         bacnet_property_names, search_name, found_index);
 }
 
@@ -1816,7 +1834,7 @@ bool bactext_event_state_index(const char *search_name, unsigned *found_index)
 
 bool bactext_event_state_strtol(const char *search_name, unsigned *found_index)
 {
-    return bactext_strtol_index(
+    return bactext_strtoul_index(
         bacnet_event_state_names, search_name, found_index);
 }
 
@@ -2082,7 +2100,7 @@ const char *bactext_life_safety_operation_name(unsigned index)
     }
 }
 
-INDTEXT_DATA life_safety_state_names[] = {
+INDTEXT_DATA bactext_life_safety_state_names[] = {
     { LIFE_SAFETY_STATE_QUIET, "quiet" },
     { LIFE_SAFETY_STATE_PRE_ALARM, "pre-alarm" },
     { LIFE_SAFETY_STATE_ALARM, "alarm" },
@@ -2125,7 +2143,7 @@ const char *bactext_life_safety_state_name(unsigned index)
 {
     if (index < LIFE_SAFETY_STATE_PROPRIETARY_MIN) {
         return indtext_by_index_default(
-            life_safety_state_names, index, ASHRAE_Reserved_String);
+            bactext_life_safety_state_names, index, ASHRAE_Reserved_String);
     } else if (index <= LIFE_SAFETY_STATE_PROPRIETARY_MAX) {
         return Vendor_Proprietary_String;
     } else {
@@ -2153,7 +2171,7 @@ const char *bactext_silenced_state_name(unsigned index)
     }
 }
 
-INDTEXT_DATA lighting_in_progress[] = {
+INDTEXT_DATA bacnet_lighting_in_progress_names[] = {
     { BACNET_LIGHTING_IDLE, "idle" },
     { BACNET_LIGHTING_FADE_ACTIVE, "fade" },
     { BACNET_LIGHTING_RAMP_ACTIVE, "ramp" },
@@ -2167,13 +2185,13 @@ const char *bactext_lighting_in_progress(unsigned index)
 {
     if (index < MAX_BACNET_LIGHTING_IN_PROGRESS) {
         return indtext_by_index_default(
-            lighting_in_progress, index, ASHRAE_Reserved_String);
+            bacnet_lighting_in_progress_names, index, ASHRAE_Reserved_String);
     } else {
         return "Invalid BACnetLightingInProgress";
     }
 }
 
-INDTEXT_DATA lighting_transition[] = {
+INDTEXT_DATA bacnet_lighting_transition_names[] = {
     { BACNET_LIGHTING_TRANSITION_NONE, "none" },
     { BACNET_LIGHTING_TRANSITION_FADE, "fade" },
     { BACNET_LIGHTING_TRANSITION_RAMP, "ramp" },
@@ -2184,7 +2202,7 @@ const char *bactext_lighting_transition(unsigned index)
 {
     if (index < BACNET_LIGHTING_TRANSITION_PROPRIETARY_MIN) {
         return indtext_by_index_default(
-            lighting_transition, index, ASHRAE_Reserved_String);
+            bacnet_lighting_transition_names, index, ASHRAE_Reserved_String);
     } else if (index <= BACNET_LIGHTING_TRANSITION_PROPRIETARY_MAX) {
         return Vendor_Proprietary_String;
     } else {
@@ -2222,7 +2240,7 @@ const char *bactext_lighting_operation_name(unsigned index)
 bool bactext_lighting_operation_strtol(
     const char *search_name, unsigned *found_index)
 {
-    return bactext_strtol_index(
+    return bactext_strtoul_index(
         bacnet_lighting_operation_names, search_name, found_index);
 }
 
@@ -2252,7 +2270,7 @@ const char *bactext_binary_lighting_pv_name(unsigned index)
 bool bactext_binary_lighting_pv_names_strtol(
     const char *search_name, unsigned *found_index)
 {
-    return bactext_strtol_index(
+    return bactext_strtoul_index(
         bacnet_binary_lighting_pv_names, search_name, found_index);
 }
 
@@ -2609,3 +2627,150 @@ const char *bactext_program_error_name(unsigned index)
         return "Invalid BACnetProgramError";
     }
 }
+
+/**
+ * @brief For a given enumerated object property string,
+ *  find the enumeration value
+ * @param object_type - object type identifier
+ * @param property - object property identifier
+ * @param search_name - text string for which is searched
+ * @param found_index - if found, the value is set to this variable
+ * @return true if the string is found and found_index is set
+ * @return false if the string is not found and found_index is not set
+ */
+bool bactext_object_property_strtoul(
+    BACNET_OBJECT_TYPE object_type,
+    BACNET_PROPERTY_ID object_property,
+    const char *search_name,
+    unsigned *found_index)
+{
+    bool status = false;
+
+    switch (object_property) {
+        case PROP_PROPERTY_LIST:
+            status = bactext_strtoul_index(
+                bacnet_property_names, search_name, found_index);
+            break;
+        case PROP_OBJECT_TYPE:
+            status = bactext_strtoul_index(
+                bacnet_object_type_names, search_name, found_index);
+            break;
+        case PROP_EVENT_STATE:
+            status = bactext_strtoul_index(
+                bacnet_event_state_names, search_name, found_index);
+            break;
+        case PROP_UNITS:
+            status = bactext_strtoul_index(
+                bacnet_engineering_unit_names, search_name, found_index);
+            break;
+        case PROP_POLARITY:
+            status = bactext_strtoul_index(
+                bacnet_binary_polarity_names, search_name, found_index);
+            break;
+        case PROP_PRESENT_VALUE:
+        case PROP_RELINQUISH_DEFAULT:
+            switch (object_type) {
+                case OBJECT_BINARY_INPUT:
+                case OBJECT_BINARY_OUTPUT:
+                case OBJECT_BINARY_VALUE:
+                    status = bactext_strtoul_index(
+                        bacnet_binary_present_value_names, search_name,
+                        found_index);
+                    break;
+                case OBJECT_BINARY_LIGHTING_OUTPUT:
+                    status = bactext_strtoul_index(
+                        bacnet_binary_lighting_pv_names, search_name,
+                        found_index);
+                    break;
+                default:
+                    break;
+            }
+            break;
+        case PROP_RELIABILITY:
+            status = bactext_strtoul_index(
+                bacnet_reliability_names, search_name, found_index);
+            break;
+        case PROP_SYSTEM_STATUS:
+            status = bactext_strtoul_index(
+                bacnet_device_status_names, search_name, found_index);
+            break;
+        case PROP_SEGMENTATION_SUPPORTED:
+            status = bactext_strtoul_index(
+                bacnet_segmentation_names, search_name, found_index);
+            break;
+        case PROP_NODE_TYPE:
+            status = bactext_strtoul_index(
+                bacnet_node_type_names, search_name, found_index);
+            break;
+        case PROP_TRANSITION:
+            status = bactext_strtoul_index(
+                bacnet_lighting_transition_names, search_name, found_index);
+            break;
+        case PROP_IN_PROGRESS:
+            status = bactext_strtoul_index(
+                bacnet_lighting_in_progress_names, search_name, found_index);
+            break;
+        case PROP_LOGGING_TYPE:
+            status = bactext_strtoul_index(
+                bactext_logging_type_names, search_name, found_index);
+            break;
+        case PROP_MODE:
+        case PROP_ACCEPTED_MODES:
+            status = bactext_strtoul_index(
+                bactext_life_safety_mode_names, search_name, found_index);
+            break;
+        case PROP_OPERATION_EXPECTED:
+            status = bactext_strtoul_index(
+                bactext_life_safety_operation_names, search_name, found_index);
+            break;
+        case PROP_TRACKING_VALUE:
+            switch (object_type) {
+                case OBJECT_LIFE_SAFETY_POINT:
+                case OBJECT_LIFE_SAFETY_ZONE:
+                    status = bactext_strtoul_index(
+                        bactext_life_safety_state_names, search_name,
+                        found_index);
+                    break;
+                default:
+                    break;
+            }
+            break;
+        case PROP_PROGRAM_CHANGE:
+            status = bactext_strtoul_index(
+                bactext_program_request_names, search_name, found_index);
+            break;
+        case PROP_PROGRAM_STATE:
+            status = bactext_strtoul_index(
+                bactext_program_state_names, search_name, found_index);
+            break;
+        case PROP_REASON_FOR_HALT:
+            status = bactext_strtoul_index(
+                bactext_program_error_names, search_name, found_index);
+            break;
+        case PROP_NETWORK_NUMBER_QUALITY:
+            status = bactext_strtoul_index(
+                bactext_network_number_quality_names, search_name, found_index);
+            break;
+        case PROP_NETWORK_TYPE:
+            status = bactext_strtoul_index(
+                bactext_network_port_type_names, search_name, found_index);
+            break;
+        case PROP_PROTOCOL_LEVEL:
+            status = bactext_strtoul_index(
+                bactext_protocol_level_names, search_name, found_index);
+            break;
+        case PROP_EVENT_TYPE:
+            status = bactext_strtoul_index(
+                bacnet_event_type_names, search_name, found_index);
+            break;
+        case PROP_NOTIFY_TYPE:
+            status = bactext_strtoul_index(
+                bacnet_notify_type_names, search_name, found_index);
+            break;
+        default:
+            status = bactext_strtoul(search_name, found_index);
+            break;
+    }
+
+    return status;
+}
diff --git a/src/bacnet/bactext.h b/src/bacnet/bactext.h
index 810d3289..180d6c01 100644
--- a/src/bacnet/bactext.h
+++ b/src/bacnet/bactext.h
@@ -198,6 +198,15 @@ const char *bactext_program_state_name(unsigned index);
 BACNET_STACK_EXPORT
 const char *bactext_program_error_name(unsigned index);
 
+BACNET_STACK_EXPORT
+bool bactext_strtoul(const char *search_name, unsigned *found_index);
+BACNET_STACK_EXPORT
+bool bactext_object_property_strtoul(
+    BACNET_OBJECT_TYPE object_type,
+    BACNET_PROPERTY_ID object_property,
+    const char *search_name,
+    unsigned *found_index);
+
 #ifdef __cplusplus
 }
 #endif /* __cplusplus */