Update assignment3.md

assignments/assignment3.md

@@ -105,4 +105,39 @@ Sample Document:
 
 ### Reference:
 https://kairosdb.github.io/docs/restapi/QueryMetrics.html
+
 https://pypi.org/project/kairosdb-python/
+
+
+## Task 3: Working with MQTT & REDIS
+
+# Description
+Data from different sites will be pushed with frequency of 10 seconds for the parameters PM10,PM2.5,SO2,NO2 via mqtt.
+
+data can be of different quality - Good ( 0 ), Maintainance ( 1 ), Error ( 2 )
+
+Based on the quality of data update to different redis database.
+
+sample data format: 
+```json
+  {
+		"data" : { "PM10" : 100 , "PM2.5": 23, "SO2":21, "NO2": 32}
+		"site_id" : "site_100",
+		"data_quality": 1
+		}
+```
+	   
+Use Redis for caching/storing information
+
+create consumer's which consumes data from these topics and store to a redis db based on data quality.
+
+### Tools to use: 
+1. Pycharm / VSCode
+2. MQTT - (paho-mqtt)
+3. REDIS - (redis)
+
+### Reference:
+https://www.emqx.com/en/blog/how-to-use-mqtt-in-python
+
+https://docs.redis.com/latest/rs/references/client_references/client_python/
+