Adjust incoming message on channel 0

src/FirmwarePlugin/APM/APMFirmwarePlugin.cc

@@ -251,9 +251,12 @@ void APMFirmwarePlugin::_handleIncomingParamValue(Vehicle* vehicle, mavlink_mess
 
     paramValue.param_value = paramUnion.param_float;
 
+    // Re-Encoding is always done using mavlink 1.0
+    mavlink_status_t* mavlinkStatusReEncode = mavlink_get_channel_status(0);
+    mavlinkStatusReEncode->flags |= MAVLINK_STATUS_FLAG_IN_MAVLINK1;
     mavlink_msg_param_value_encode_chan(message->sysid,
                                         message->compid,
-                                        vehicle->priorityLink()->mavlinkChannel(),
+                                        0,                  // Re-encoding uses reserved channel 0
                                         message,
                                         &paramValue);
 }
@@ -522,10 +525,14 @@ void APMFirmwarePlugin::_adjustSeverity(mavlink_message_t* message) const
         break;
     }
 
-    mavlink_msg_statustext_encode(message->sysid,
-                                  message->compid,
-                                  message,
-                                  &statusText);
+    // Re-Encoding is always done using mavlink 1.0
+    mavlink_status_t* mavlinkStatusReEncode = mavlink_get_channel_status(0);
+    mavlinkStatusReEncode->flags |= MAVLINK_STATUS_FLAG_IN_MAVLINK1;
+    mavlink_msg_statustext_encode_chan(message->sysid,
+                                       message->compid,
+                                       0,                  // Re-encoding uses reserved channel 0
+                                       message,
+                                       &statusText);
 }
 
 void APMFirmwarePlugin::_setInfoSeverity(mavlink_message_t* message) const
@@ -533,19 +540,26 @@ void APMFirmwarePlugin::_setInfoSeverity(mavlink_message_t* message) const
     mavlink_statustext_t statusText;
     mavlink_msg_statustext_decode(message, &statusText);
 
+    // Re-Encoding is always done using mavlink 1.0
+    mavlink_status_t* mavlinkStatusReEncode = mavlink_get_channel_status(0);
+    mavlinkStatusReEncode->flags |= MAVLINK_STATUS_FLAG_IN_MAVLINK1;
     statusText.severity = MAV_SEVERITY_INFO;
-    mavlink_msg_statustext_encode(message->sysid,
-                                  message->compid,
-                                  message,
-                                  &statusText);
+    mavlink_msg_statustext_encode_chan(message->sysid,
+                                       message->compid,
+                                       0,                  // Re-encoding uses reserved channel 0
+                                       message,
+                                       &statusText);
 }
 
 void APMFirmwarePlugin::_adjustCalibrationMessageSeverity(mavlink_message_t* message) const
 {
     mavlink_statustext_t statusText;
     mavlink_msg_statustext_decode(message, &statusText);
+    // Re-Encoding is always done using mavlink 1.0
+    mavlink_status_t* mavlinkStatusReEncode = mavlink_get_channel_status(0);
+    mavlinkStatusReEncode->flags |= MAVLINK_STATUS_FLAG_IN_MAVLINK1;
     statusText.severity = MAV_SEVERITY_INFO;
-    mavlink_msg_statustext_encode(message->sysid, message->compid, message, &statusText);
+    mavlink_msg_statustext_encode_chan(message->sysid, message->compid, 0, message, &statusText);
 }
 
 void APMFirmwarePlugin::initializeVehicle(Vehicle* vehicle)

src/comm/LinkManager.cc

@@ -186,8 +186,8 @@ void LinkManager::_addLink(LinkInterface* link)
     if (!_links.contains(link)) {
         bool channelSet = false;
 
-        // Find a mavlink channel to use for this link
-        for (int i=0; i<32; i++) {
+        // Find a mavlink channel to use for this link, Channel 0 is reserved for internal use.
+        for (int i=1; i<32; i++) {
             if (!(_mavlinkChannelsUsedBitMask & 1 << i)) {
                 mavlink_reset_channel_status(i);
                 link->_setMavlinkChannel(i);