Lora-E5-Dev ANY working LoRa examples?

A LINK_UP event was recently introduced. As a result, the driver will call NETDEV_EVENT_LINK_UP on init. However, the event_callback function pointer must be set before calling init, otherwise it will try to call a NULL pointer function.

I noticed that tests/driver_sx126x actually sets the event_callback after calling init, which used to be not a problem. But we should change that now.

@Ingmar_M @HoCoK could you please try the following patch?

diff --git a/tests/driver_sx126x/main.c b/tests/driver_sx126x/main.c
index 104905e480..038aa86fff 100644
--- a/tests/driver_sx126x/main.c
+++ b/tests/driver_sx126x/main.c
@@ -325,13 +325,13 @@ int main(void)
 
     netdev->driver = &sx126x_driver;
 
+    netdev->event_callback = _event_cb;
+
     if (netdev->driver->init(netdev) < 0) {
         puts("Failed to initialize SX126X device, exiting");
         return 1;
     }
 
-    netdev->event_callback = _event_cb;
-
     _recv_pid = thread_create(stack, sizeof(stack), THREAD_PRIORITY_MAIN - 1,
                               THREAD_CREATE_STACKTEST, _recv_thread, netdev,
                               "recv_thread");