Send PROTOBUF over serial without delay

src/mesh/StreamAPI.cpp

@@ -103,10 +103,7 @@ void StreamAPI::emitTxBuffer(size_t len)
 
         auto totalLen = len + HEADER_LEN;
         stream->write(txBuf, totalLen);
-        /* for(size_t i = 0; i < totalLen; i++) {
-            stream->write(txBuf[i]);
-            // stream->flush();
-        } */
+        stream->flush();
     }
 }
 
@@ -133,4 +130,4 @@ void StreamAPI::onConnectionChanged(bool connected)
         // received a packet in a while
         powerFSM.trigger(EVENT_SERIAL_DISCONNECTED);
     }
-}
+}