Add draft for a NodeMCU lua sensor

lua-sensor/init.lua

@@ -0,0 +1,11 @@
+FileToExecute="user.lua"
+l = file.list()
+for k,v in pairs(l) do
+  if k == FileToExecute then
+    print("*** You've got 5 sec to stop timer ***")
+    tmr.alarm(0, 5000, 0, function()
+      print("Executing ".. FileToExecute)
+      dofile(FileToExecute)
+    end)
+  end
+end

lua-sensor/user.lua

@@ -0,0 +1,77 @@
+-- MQTT connect script with deep sleep
+-- Remember to connect GPIO16 and RST to enable deep sleep
+
+--- MQTT ---
+mqtt_broker_ip = "10.42.1.101"     
+mqtt_broker_port = 1883
+mqtt_username = ""
+mqtt_password = ""
+mqtt_client_id = "therm1"
+mqtt_prefix = "maison/bureau"
+
+--- WIFI ---
+wifi_cfg = {}
+wifi_cfg.ssid = "FLRLAN"
+wifi_cfg.pwd  = "XXXXX"
+
+client_ip=""
+client_netmask=""
+client_gateway=""
+
+dht22_pin = 4
+
+--- INTERVAL ---
+time_between_sensor_readings = 120000
+
+-- Setup MQTT client and events
+m = mqtt.Client(mqtt_client_id, 120, mqtt_username, mqtt_password)
+
+-- Connect to the wifi network
+wifi.setmode(wifi.STATION)
+wifi.sta.config(wifi_cfg)
+
+if client_ip ~= "" then
+    wifi.sta.setip({ip=client_ip,netmask=client_netmask,gateway=client_gateway})
+end
+
+-- DHT22 sensor logic
+function get_sensor_data()
+    local status, temp, humi, temp_dec, humi_dec = dht.read(dht22_pin)
+    if status == dht.OK then
+        local temp_str = string.format("%d.%03d", math.floor(temp), temp_dec);
+        local humi_str = string.format("%d.%03d", math.floor(humi), humi_dec);
+        print(string.format("DHT Temperature:%s ;Humidity:%s\r\n", temp_str, humi_str))
+        return temp_str, humi_str
+    elseif status == dht.ERROR_CHECKSUM then
+        print( "DHT Checksum error." )
+        return nil, nil
+    elseif status == dht.ERROR_TIMEOUT then
+        print( "DHT timed out." )
+        return nil, nil
+    end
+end
+
+function loop()
+    if wifi.sta.status() == 5 then
+        print("Connected with " .. wifi.sta.getip())
+        -- Stop the loop
+        tmr.stop(0)
+        m:connect( mqtt_broker_ip , mqtt_broker_port, 0, function(conn)
+            print("Connected to MQTT")
+            print("  IP: ".. mqtt_broker_ip)
+            print("  Port: ".. mqtt_broker_port)
+            print("  Client ID: ".. mqtt_client_id)
+            print("  Username: ".. mqtt_username)
+            -- Get sensor data
+            local temperature, humidity = get_sensor_data()
+            m:publish(mqtt_prefix .. "/temperature", temperature, 0, 0, function(conn)
+                m:publish(mqtt_prefix .. "/humidity", humidity, 0, 0, function(conn)
+                    print("Going to deep sleep for "..(time_between_sensor_readings/1000).." seconds")
+                    node.dsleep(time_between_sensor_readings*1000)             
+                end)          
+            end)
+        end )
+    end
+end
+
+tmr.alarm(0, 100, 1, function() loop() end)