about mosquitto configuration file There is a file path /usr/share/doc/mosquitto/example/mosquitto.conf.gz when run as root, drop privileges to this user and its primary group maximum number of QoS 1 and 2 message to hold in a queue above those that are currently in-flight. Defaults to 100......... oh..no.. 100;;;; MQTT imposes a maximum payload size of 268435455 bytes.... send a message once ar..