hilink: wait for FC MSP VTX readiness before table sync

package/msposd/0001-wifilink-mspvtx-read-only.patch

@@ -1,24 +1,26 @@
 diff --git a/osd.c b/osd.c
-index a8b756e..701e989 100644
+index a8b756e..49673da 100644
 --- a/osd.c
 +++ b/osd.c
-@@ -190,6 +190,7 @@ extern bool vtxMenuActive;
+@@ -190,6 +190,8 @@ extern bool vtxMenuActive;
  extern bool vtxMenuEnabled;
  extern bool armed;
  extern bool vtxInitDone;
++static uint8_t mspVtxConfigFramesReceived;
 +static bool mspVtxTableResentAfterFcTraffic;
  extern bool DrawOSD;
  
  // SRT/OSD
-@@ -960,48 +961,24 @@ static void rx_msp_callback(msp_msg_t *msp_message) {
+@@ -960,48 +962,25 @@ static void rx_msp_callback(msp_msg_t *msp_message) {
  	}
  
  	case MSP_GET_VTX_CONFIG: {
 -		if (vtxInitDone) {
-+		// The FC starts publishing its VTX state only after its MSP descriptor is
-+		// active. Re-send our table once at that boundary: the boot-time burst can
-+		// otherwise precede FC UART/MSP initialization.
-+		if (vtxInitDone && !mspVtxTableResentAfterFcTraffic) {
++		// The FC publishes its VTX state only after its MSP descriptor is active.
++		// Wait for several frames, then send the table once. This avoids losing
++		// the boot-time burst while the FC is still bringing UART/MSP online.
++		if (vtxInitDone && !mspVtxTableResentAfterFcTraffic &&
++			++mspVtxConfigFramesReceived >= 5) {
 +			msp_set_vtx_config(serial_fd);
 +			mspVtxTableResentAfterFcTraffic = true;
 +		}