product_id 200 as thermostat RC100H, #590

src/emsesp.cpp

@@ -931,6 +931,9 @@ bool EMSESP::add_device(const uint8_t device_id, const uint8_t product_id, const
     // first check to see if we already have it, if so update the record
     for (const auto & emsdevice : emsdevices) {
         if (emsdevice && emsdevice->is_device_id(device_id)) {
+            if (product_id == 0) { // update only with valid product_id
+                return true;
+            }
             LOG_DEBUG(F("Updating details for already active deviceID 0x%02X"), device_id);
             emsdevice->product_id(product_id);
             emsdevice->version(version);