Feature/bacnet zigbee link layer handler (#70)

* Added the BZLL files to build when datalink Zigbee is selected
* Added configurable BZLL timing parameters time-to-live and interval-to-scan.

Author: luiz-santana18

zephyr/CMakeLists.txt

@@ -451,11 +451,13 @@ set(BACNETSTACK_BASIC_SRCS
     $<$<BOOL:${CONFIG_BACDL_BIP6}>:${BACNETSTACK_SRC}/bacnet/basic/bbmd6/h_bbmd6.c>
     $<$<BOOL:${CONFIG_BACDL_BIP6}>:${BACNETSTACK_SRC}/bacnet/basic/bbmd6/vmac.c>
     $<$<BOOL:${CONFIG_BACDL_ZIGBEE}>:${BACNETSTACK_SRC}/bacnet/basic/bzll/bzllvmac.c>
+    $<$<BOOL:${CONFIG_BACDL_ZIGBEE}>:${BACNETSTACK_SRC}/bacnet/basic/bzll/h_bzll.c>
     $<$<BOOL:${CONFIG_BACNET_BASIC_SERVER}>:${BACNETSTACK_SRC}/bacnet/basic/server/bacnet_basic.c>
     $<$<BOOL:${CONFIG_BACNET_BASIC_SERVER}>:${BACNETSTACK_SRC}/bacnet/basic/server/bacnet_device.c>
     $<$<BOOL:${CONFIG_BACNET_BASIC_SERVER}>:${BACNETSTACK_SRC}/bacnet/basic/server/bacnet_port.c>
     $<$<BOOL:${CONFIG_BACNET_BASIC_SERVER}>:${BACNETSTACK_SRC}/bacnet/basic/server/bacnet_port_ipv4.c>
     $<$<BOOL:${CONFIG_BACNET_BASIC_SERVER}>:${BACNETSTACK_SRC}/bacnet/basic/server/bacnet_port_ipv4.c>
+    $<$<BOOL:${CONFIG_BACNET_BASIC_SERVER}>:${BACNETSTACK_SRC}/bacnet/basic/server/bacnet_port_bzll.c>
     $<$<BOOL:${CONFIG_BACNET_BASIC_OBJECTS_ACCESS}>:${BACNETSTACK_SRC}/bacnet/basic/object/access_credential.c>
     $<$<BOOL:${CONFIG_BACNET_BASIC_OBJECTS_ACCESS}>:${BACNETSTACK_SRC}/bacnet/basic/object/access_door.c>
     $<$<BOOL:${CONFIG_BACNET_BASIC_OBJECTS_ACCESS}>:${BACNETSTACK_SRC}/bacnet/basic/object/access_point.c>
@@ -587,6 +589,8 @@ zephyr_compile_definitions(
   BACNET_VENDOR_NAME="${CONFIG_BACNET_VENDOR_NAME}"
   BACNET_PROTOCOL_REVISION=${CONFIG_BACNET_PROTOCOL_REVISION}
   BACNET_STACK_DEPRECATED_DISABLE=1
+  $<$<BOOL:${CONFIG_BZLL_NODE_TIME_TO_LIVE_S}>:BZLL_NODE_TIME_TO_LIVE_S=${CONFIG_BZLL_NODE_TIME_TO_LIVE_S}>
+  $<$<BOOL:${CONFIG_BZLL_SCAN_NODES_INTERVAL_S}>:BZLL_SCAN_NODES_INTERVAL_S=${CONFIG_BZLL_SCAN_NODES_INTERVAL_S}>
   # datalink API
   $<$<BOOL:${CONFIG_BACDL_NONE}>:BACDL_NONE>
   $<$<BOOL:${CONFIG_BACDL_ALL}>:BACAPP_ALL>

zephyr/subsys/Kconfig

@@ -4,6 +4,7 @@
 
 comment "BACnet Subsystems"
 
+rsource "bacnet_datalink/Kconfig"
 rsource "bacnet_settings/Kconfig"
 rsource "bacnet_shell/Kconfig"
 rsource "object/Kconfig"

zephyr/subsys/bacnet_datalink/Kconfig

@@ -0,0 +1,26 @@
+# Kconfig - Subsystem configuration options
+#
+# @author Luiz Santana <luiz.santana@dsr-corporation.com>
+# @date May 2026
+# @copyright SPDX-License-Identifier: Apache-2.0
+menuconfig BACNET_DATALINK_SETTINGS
+    bool "BACNET_DATALINK_SETTINGS"
+    default y if BACNETSTACK
+    help
+      This option enables BACnet datalink settings.
+
+if BACNET_DATALINK_SETTINGS
+
+    config BZLL_NODE_TIME_TO_LIVE_S
+        int "BZLL node time-to-live in the VMAC table"
+        default 600
+        help
+           Time in seconds to keep a node in the VMAC table before it must be updated.
+
+    config BZLL_SCAN_NODES_INTERVAL_S
+        int "BZLL interval for scanning the Zigbee network for BACnet nodes and updating the VMAC table"
+        default 3600
+        help
+           Time interval in seconds between scans of the Zigbee network for BACnet nodes to update the VMAC table.
+
+endif # BACNET_DATALINK_SETTINGS

zephyr/subsys/bacnet_settings/bacnet_settings.c

@@ -323,7 +323,7 @@ bool bacnet_settings_value_parse(
         return false;
     }
     /* convert the string value into a tagged union value */
-    if (isalpha(value_string[0])) {
+    if (isalpha((unsigned char)value_string[0])) {
         if (property_list_commandable_member(object_type, property_id) &&
             (bacnet_strnicmp(value_string, "NULL", 4) == 0)) {
             /* check for case insensitive NULL string */

zephyr/subsys/bacnet_settings/bacnet_storage_shell.c

@@ -10,6 +10,7 @@
 #include <errno.h>
 #include <zephyr/shell/shell.h>
 #include <bacnet_settings/bacnet_storage.h>
+#include <stdio.h>
 
 static const char Storage_Base_Name[] = CONFIG_BACNET_STORAGE_BASE_NAME;
 

zephyr/subsys/bacnet_shell/bacnet_shell_property.c

@@ -117,7 +117,7 @@ int bacnet_shell_property_parse(
     }
     err = bacnet_shell_object_type_instance_parse(
         sh, argc, argv, object_type, object_instance);
-    if (isalpha(argv[3][0])) {
+    if (isalpha((unsigned char)argv[3][0])) {
         /* choose a property by name with optional [] to denote array */
         scan_count = sscanf(argv[3], "%79[^[][%u]", name, &array_value);
         if (scan_count < 1) {