Update MQTT publish example and add MQTT subscribe example.

This commit is contained in:
iabdalkader 2019-09-12 00:13:59 +02:00
parent 76239ea89f
commit 77c20412a8
2 changed files with 41 additions and 3 deletions

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# MQTT Example.
# This example shows how to use the MQTT library.
# This example shows how to use the MQTT library to publish to a topic.
#
# 1) Copy the mqtt.py library to OpenMV storage.
# 2) Install the mosquitto client on PC and run the following command:
# 2) Run this script on the OpenMV camera.
# 3) Install the mosquitto client on PC and run the following command:
# mosquitto_sub -h test.mosquitto.org -t "openmv/test" -v
#
# Note: If the mosquitto broker is down (OSError -12) try a different one (ex: broker.hivemq.com)
# NOTE: If the mosquitto broker is unreachable, try another broker (For example: broker.hivemq.com)
import time, network
from mqtt import MQTTClient

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# MQTT Example.
# This example shows how to use the MQTT library to subscribe to a topic.
#
# 1) Copy the mqtt.py library to OpenMV storage.
# 2) Run this script on the OpenMV camera.
# 3) Install the mosquitto client on PC and run the following command:
# mosquitto_pub -t "openmv/test" -m "Hello World!" -h test.mosquitto.org -p 1883
#
# NOTE: If the mosquitto broker is unreachable, try another broker (For example: broker.hivemq.com)
import time, network
from mqtt import MQTTClient
SSID='' # Network SSID
KEY='' # Network key
# Init wlan module and connect to network
print("Trying to connect... (may take a while)...")
wlan = network.WINC()
wlan.connect(SSID, key=KEY, security=wlan.WPA_PSK)
# We should have a valid IP now via DHCP
print(wlan.ifconfig())
client = MQTTClient("openmv", "test.mosquitto.org", port=1883)
client.connect()
def callback(topic, msg):
print(topic, msg)
# must set callback first
client.set_callback(callback)
client.subscribe("openmv/test")
while (True):
client.check_msg() # poll for messages.
time.sleep(1000)