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8266:

Arduino IDE client for MQTT on 8266

• API docs

Mosquitto:

getting started tutorial another getting started tutorial documentation mosquitto test server mosquitto has a limit of the number of open connections as defined by ulimit -n. It defaults to 1024 but can be increased e.g. sudo ulimit -n 2048

• make the limit setting permanent by editing /etc/security/limits.conf as explained here
• also change /etc/sysctl.conf with open file settings

explore limits as in this thread

mosquitto client:

example pub call: mosquitto_pub -h filimin.no-ip.info -p 8883 -d -t hello/world -m “Hello World” –insecure –cafile /tmp/ca.crt -I ESP8266

• -d enable debug messages
• –insecure accept the certificate even if it doesn't match the host name
• –cafile this must match the cafile on the server…and you can't do an SSL-encrypted call from the client apparently without this file.
• -I ID prefix for client name

cleansession and the retain flag

• conclusion: it appears clean session only has meaning with QoS > 0

erase all retained messages: mosquitto_sub -i <client_id> -p <port> -h <host> –retained-only -t “#” -v | while read line; do let “x=x+1”; echo $x; mosquitto_pub -i <client_id> -p <port> -h <host> -t “${line% *}” -r -n; done'

HA Proxy:

Configuring for high # of connections (tested on 16.04)