Read receiver more intelligently

[ktind]

Currently 1 page of each record type is read with every device poll. This is satisfactory for an OTG connection but presents a challenge with BLE due to the bandwidth constraints. Reading 1 page for each record is slow via BLE and causes delay in getting the data to the user.

We should be able to make intelligent assumptions based on data that we have and the options the user has selected in order to reduce the amount of data that we read. This should get the data to the user a little faster.