Improve debug logging in OTA server (#1377)

Signed-off-by: Chris Jackson <chris@cd-jackson.com>

Author: cdjackson

com.zsmartsystems.zigbee/src/main/java/com/zsmartsystems/zigbee/app/otaserver/ZclOtaUpgradeServer.java

@@ -737,6 +737,9 @@ private boolean handleQueryNextImageCommand(QueryNextImageCommand command) {
                 && otaFile.getMaximumHardware() != null) {
             if (command.getHardwareVersion() < otaFile.getMinimumHardware()
                     || command.getHardwareVersion() > otaFile.getMaximumHardware()) {
+                logger.debug(
+                        "{} OTA Error: Request is inconsistent with hardware - requested={}, file min={}, file max={}",
+                        command.getHardwareVersion(), otaFile.getMinimumHardware(), otaFile.getMaximumHardware());
                 sendNoImageAvailableResponse(command);
                 return true;
             }
@@ -745,6 +748,7 @@ private boolean handleQueryNextImageCommand(QueryNextImageCommand command) {
         // Some devices may make further requests for files once they have been updated
         // By default, don't resend the existing file
         if (!allowExistingFile && command.getFileVersion().equals(otaFile.getFileVersion())) {
+            logger.debug("{} OTA Error: Request is for existing file version {}", command.getFileVersion());
             sendNoImageAvailableResponse(command);
             return true;
         }

com.zsmartsystems.zigbee/src/main/java/com/zsmartsystems/zigbee/app/otaserver/ZigBeeOtaUpgradeExtension.java

@@ -63,7 +63,7 @@ public void nodeAdded(ZigBeeNode node) {
 
         /*
          * We've confirmed there is no current application registered, so register the ZclOtaUpgradeServer to the first
-         * endpoint supplorting OTA upgrades
+         * endpoint supporting OTA upgrades
          */
         for (ZigBeeEndpoint endpoint : node.getEndpoints()) {
             if (endpoint.getOutputCluster(ZclOtaUpgradeCluster.CLUSTER_ID) != null) {