Investigate improved default values for data poll rate and data post rate

[alexjhawk]

Currently, the default data poll rate is 5000ms, and the default data post rate is 5000ms.

After implementing the maximum payload restriction in #130, the connector frequently skips data polling because the payload queue is full.

• Increasing the data post rate (lower value, such as 2000ms or 2500ms) causes a significant amount of HTTP failures that were not present at 5000ms (see Improve HTTP response file behavior #136).
• Decreasing the data poll rate (higher value, such as 10000ms) has the unintended side effect of delaying data longer than expected or desired.