ncm: add weak callback for initial link state

netd_init resets link_is_up to a compile-time default, which is
incorrect when the host reboots without power-cycling the device.
Add tud_network_default_link_state_cb() so applications can return
the actual physical link state. The weak default preserves existing
CFG_TUD_NCM_DEFAULT_LINK_UP behaviour.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/class/net/net_device.h b/src/class/net/net_device.h
index 332df09b3..1ad069d92 100644
--- a/src/class/net/net_device.h
+++ b/src/class/net/net_device.h
@@ -106,6 +106,10 @@ extern uint8_t tud_network_mac_address[6];
 // Optional callback: informs the application about host requested packet filter bits
 void tud_network_set_packet_filter_cb(uint16_t packet_filter);
 
+// Optional callback: called during netd_init() to get the initial link state.
+// Override to return the actual physical link state instead of the compile-time default.
+bool tud_network_default_link_state_cb(void);
+
 // Set the network link state (up/down) and notify the host
 void tud_network_link_state(uint8_t rhport, bool is_up);