# eMQTT $SYS Topics

## Version

$SYS/broker/version

## Uptime

$SYS/broker/uptime

## Recevied and Sent

$SYS/broker/bytes/received
$SYS/broker/bytes/sent

$SYS/broker/packets/received
$SYS/broker/packets/sent

$SYS/broker/messages/received
$SYS/broker/messages/sent
$SYS/broker/messages/retained
$SYS/broker/messages/stored
$SYS/broker/messages/dropped

## Client Presence

$SYS/broker/clients/connected
$SYS/broker/clients/disconnected

$SYS/broker/clients/${clientId}/presences/online
$SYS/broker/clients/${clientId}presences/offline