Hi , I am struggling to pair to the Smart Shunt. I am asked to enter the code on the Smart shunt ? There is only a Part Number , serial number and a QR code on a label on the device. .I can pair to the other items , Solar and DC but not the shunt. I have disconnected it , remove the app and reinstalled it. I only get the option for a numeric code to be entered . I have tried 000000. Thanks