Sid,
are you getting no record at all? or are you getting blank records? it seems like Sai suggestion would be correct.
when you set the model, are you able to read those records in the model? if so, then what is the model path... based on your screenshots, you should be able to access it by the /d/results path.
and again as per Sai suggestion, the text and key property should be {PlotNo}
one more thing to check would be your _getData function in the controller.. are you correctly building the URL with the filter you are concatenating? please copy that url you are building into the browser and make sure you get some results... make sure the end point is also being called correctly and the BpId is also being read correctly from your call