print on frwite error

Author: andreagilardoni

src/ota/interface/OTAInterfaceDefault.cpp

@@ -35,9 +35,12 @@ OTACloudProcessInterface::State OTADefaultCloudProcessInterface::startOTA() {
   context = new Context(
     OTACloudProcessInterface::context->url,
     [this](uint8_t c) {
-      // int res =
+      int res =
         this->writeFlash(&c, 1);
 
+      if(res != 1) {
+        DEBUG_VERBOSE("frwrite error %d", res);
+      }
       // TODO report error in write flash, throw it?
     }
   );