======mqtt_subscribe======
WMPRO, WMMINI FW >= 1.1074 WMMEGA FW >= 2.1078
Subscribe to an MQTT channel
====Description====
mqtt_subscribe (
string
$channel,
string
$callback
)
====Parameters====
$channel: Channel to subscribe to. See [[uphp:mqtt_configuration|MQTT Configuration]]
$callback: Callback script to execute upon receipt of a message
====Return Values====
1 if successful and 0 on failure
====Example====
====Example Callback====
Callbacks can use the ''stdin'' file to read input. Use fgets() to get the first line, which will be the full channel. The following lines will be the data received.
====Note=====
On WattmonPRO & MINI the maximum packet size is 128 bytes. On WattmonMega, M2 & Mini2 the maximum packet size is 2048 bytes.
====See Also====
[[mqtt_publish()]] - Publish to an MQTT channel