Scale periodically reads 0 kg

[ciozi137]

scale periodically reads 0 kg.

Proposed fix: add read validation code: valid string: ASNG/W+\s38.20\s\skg\s\s\r\n

• does return string begin with ASN?
• After ASN G/W?
• does string end with \r\n?

If AND all == F: repeat read operation

[ciozi137]

A: communication address set by user S: stable N: no error G/W: gross weight

• 2.99 xx xx: unit (kg, pounds, ounces, or pounds-ounces)