Fixed our interface to Zephyr net manager API changes in v4.2.0.

Author: skarg

README.md

@@ -61,6 +61,25 @@ of the following ways:
 
     `west init -m https://github.com/bacnet-stack/bacnet-stack-zephyr --mr default $my_workspace`
 
+  - Note that as Zephyr OS versions change, their API often changes.
+    This library will use the following methods to accommodate the changes:
+    1. Use defines from <zephyr/version.h> for API changes:
+       ```
+       #if ZEPHYR_VERSION_CODE >= ZEPHYR_VERSION(4,2,0)
+       typedef uint64_t mgmt_event_t;
+       #else
+       typedef uint32_t mgmt_event_t;
+       #endif
+       ```
+    2. In CMakeLists.txt via trying to load specific versions of the Zephyr
+       package or checking using:
+       ```
+       if ("${KERNEL_VERSION_STRING}" VERSION_GREATER_EQUAL "4.2.0")
+       # Do stuff...
+       endif()
+       ```
+    3. In Kconfig by using 2 above and trying to load specific versions
+       of the Zephyr plugin and updating CONF_FILE accordingly.
 
 ## Hello BACnet Stack
 

zephyr/subsys/bacnet_datalink/bip-init.c

@@ -13,6 +13,7 @@
 #include <zephyr/sys/printk.h>
 #include <zephyr/net/net_if.h>
 #include <zephyr/net/socket.h>
+#include <zephyr/version.h>
 /* BACnet Stack defines - first */
 #include "bacnet/bacdef.h"
 /* BACnet Stack API */
@@ -403,14 +404,20 @@ int bip_send_pdu(
     return bvlc_send_pdu(dest, npdu_data, pdu, pdu_len);
 }
 
+#if ZEPHYR_VERSION_CODE >= ZEPHYR_VERSION(4, 2, 0)
+typedef uint64_t mgmt_event_t;
+#else
+typedef uint32_t mgmt_event_t;
+#endif
+
 struct wait_data {
     struct k_sem sem;
     struct net_mgmt_event_callback cb;
 };
 
 static void event_cb_handler(
     struct net_mgmt_event_callback *cb,
-    uint32_t mgmt_event,
+    mgmt_event_t mgmt_event,
     struct net_if *iface)
 {
     struct wait_data *wait = CONTAINER_OF(cb, struct wait_data, cb);
@@ -420,7 +427,7 @@ static void event_cb_handler(
     }
 }
 
-static void wait_for_net_event(struct net_if *iface, uint32_t event)
+static void wait_for_net_event(struct net_if *iface, mgmt_event_t event)
 {
     struct wait_data wait;