Unexplained data loss from sensors

[jmbrunskill]

Describe the bug

Some times data points are missing from data collection, this seems more common with some sensors, perhaps due to connectivity issues or maybe due to concurrency issues with multiple sensors in use?

Example data collection report for ~20days

Here's an example of data missing in postgres (dashboard) as well as on the tablet.

To Reproduce
Steps to reproduce the behavior:

1. Run a tablet with potentially marginal connectivity to the sensor (possibly more than 1 sensor?)

Expected behavior
No missing data points

Additional context
Source of dataloss is not known yet.

A previous similar issue was found to be an issue with battery level being read during downloads, which should be fixed now?

[adamdewey]

Seems that this could be a bigger issue that initially thought - current client looks to be experiencing this in the field quite frequently:

[adamdewey]

Just losing about 1 per day, on an occasional basis now

[adamdewey]

Possibly related to #289