Question

RUT955K (RUT9XX_R_00.06.07.5), System Temperature via MQTT:

I'm polling Modbus and MQTT in different uncorrelated engines since neither MQTT nor Modbus have a complete set of information.

Readings:

• 170
• 140
• 100
• 110
• 80
• 50
• 10
• 00 - Curious, not zero (Most closely correlated Modbus poll shows 0)
• 42949672940 - Unsigned? But it's too many digits, a trailing zero. 4294967294 is -2. (Modbus poll prior shows -10 0.1C, Modbus poll after shows -20 0.1C)

Is that supposed to be -2C? (Not what the documentation indicates, 0.1C increments).

Is that supposed to be -0.2C? Concatenating a zero to the string doesn't make it 0.1C increments.

Comments

Another unit just did it, MQTT system temperature = 42949672950. Firmware RUT9XX_R_00.06.05.3.

Answer 1

Hi,

This is the issue with Quectel, they're not parsing out negative numbers correctly, so when you try to check the temperature - it gives you not the right number. Unfortunately, there's nothing much we can do about it.

EB.