MQTT communication should be robust, GPAD_API FIRMWARE_VERSION "0.12,

[ForrestErickson]

Describe the bug
A clear and concise description of what the bug is.
Short Summary of the expected behavior: MQTT communication should be robust. It should recover if interrupted for example.
Short Summary of the buggy behavior: It looks as if from 9 AM till nearly midnight 23:14:56 the MQTT connection was abonrmal

Serial Monitor Screen Shot

Send from PMD Processing the A2 command

To Reproduce
Steps to reproduce the behavior:

1. Use the Processing sketch
   

2. Load the Krake prototype with firmware FIRMWARE_VERSION "0.12 "

3. Let run and watch on serial monitor and hope

4. See error

Expected behavior
A clear and concise description of what you expected to happen.
If the MQTT connection is reported lost, reconnection should be reported too.

Screenshots
If applicable, add screenshots to help explain your problem.

Hardware description
Model: Homework2 Assembly from JLCPCB with LCD and DFPlayer
Serial Number: 20240421_USA1
Other:

[ForrestErickson]

Re scaling the Serial Monitor revealed that reconnection success was reported

Here is the text

Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...success!
09:33:23.500 -> Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...success!
10:25:02.221 -> Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...success!
11:32:53.620 -> Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...success!
11:34:53.036 -> Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...success!
11:36:44.863 -> Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...success!
11:56:06.209 -> Attempting MQTT connection...failed, rc=-4Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...success!
23:14:56.580 -> Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...failed, rc=-2Attempting MQTT connection...success!
11:12:38.187 -> Message arrived [KRAKE_20240421_USA1_ALM] |a2MessageFromProcessing_PMD:2|

[ForrestErickson]

Perhaps the formatting of the MQTT failure reported on the serial could be cleaned up for more human friendly review.

Should the LCD Display warn the user of MQTT connection failure?

[ForrestErickson]

Note regarding this issue. To really test MQTT communication interruption we must have a Broker which we can control so as to make unavailable and available during our testing.

Such a broker is MOSQUITO. It can be installed on PCs and Linux machines like RaspberryPi and I assume MACs.