publishing_mqtt = false publishing_http = false watchdog = tmr.create() push_timer = tmr.create() chip_id = string.format("%06X", node.chipid()) device_id = "esp8266_" .. chip_id mqtt_prefix = "sensor/" .. device_id mqttclient = mqtt.Client(device_id, 120) dofile("config.lua") print("SCD4x " .. chip_id) ledpin = 4 gpio.mode(ledpin, gpio.OUTPUT) gpio.write(ledpin, 0) scd4x = require("scd4x") i2c.setup(0, 2, 1, i2c.SLOW) function log_restart() print("Network error " .. wifi.sta.status()) end function setup_client() print("Connected") gpio.write(ledpin, 1) if not scd4x.start() then print("SCD4x initialization error") end publishing_mqtt = true mqttclient:publish(mqtt_prefix .. "/state", "online", 0, 1, function(client) publishing_mqtt = false push_timer:start() push_data() end) end function connect_mqtt() print("IP address: " .. wifi.sta.getip()) print("Connecting to MQTT " .. mqtt_host) mqttclient:on("connect", hass_register) mqttclient:on("offline", log_restart) mqttclient:lwt(mqtt_prefix .. "/state", "offline", 0, 1) mqttclient:connect(mqtt_host) end function connect_wifi() print("WiFi MAC: " .. wifi.sta.getmac()) print("Connecting to ESSID " .. station_cfg.ssid) wifi.eventmon.register(wifi.eventmon.STA_GOT_IP, connect_mqtt) wifi.eventmon.register(wifi.eventmon.STA_DHCP_TIMEOUT, log_restart) wifi.eventmon.register(wifi.eventmon.STA_DISCONNECTED, log_restart) wifi.setmode(wifi.STATION) wifi.sta.config(station_cfg) wifi.sta.connect() end function push_data() local co2, raw_temp, raw_humi = scd4x.read() if co2 == nil then print("SCD4x error") else local json_str = string.format('{"co2_ppm": %d, "temperature_degc": %d.%d, "humidity_relpercent": %d.%d, "rssi_dbm": %d}', co2, raw_temp/65536 - 45, (raw_temp%65536)/6554, raw_humi/65536, (raw_humi%65536)/6554, wifi.sta.getrssi()) local influx_str = string.format("co2_ppm=%d,temperature_degc=%d.%d,humidity_relpercent=%d.%d", co2, raw_temp/65536 - 45, (raw_temp%65536)/6554, raw_humi/65536, (raw_humi%65536)/6554) if not publishing_mqtt then publishing_mqtt = true watchdog:start(true) gpio.write(ledpin, 0) mqttclient:publish(mqtt_prefix .. "/data", json_str, 0, 0, function(client) publishing_mqtt = false if influx_url and influx_attr and influx_str then publish_influx(influx_str) else gpio.write(ledpin, 1) collectgarbage() end end) end end end function publish_influx(payload) if not publishing_http then publishing_http = true http.post(influx_url, influx_header, "scd4x" .. influx_attr .. " " .. payload, function(code, data) publishing_http = false gpio.write(ledpin, 1) collectgarbage() end) end end function hass_register() local hass_device = string.format('{"connections":[["mac","%s"]],"identifiers":["%s"],"model":"ESP8266 + SCD4x","name":"SCD4x %s","manufacturer":"derf"}', wifi.sta.getmac(), device_id, chip_id) local hass_entity_base = string.format('"device":%s,"state_topic":"%s/data","expire_after":600', hass_device, mqtt_prefix) local hass_co2 = string.format('{%s,"name":"CO₂","object_id":"%s_co2","unique_id":"%s_co2","device_class":"carbon_dioxide","unit_of_measurement":"ppm","value_template":"{{value_json.co2_ppm}}"}', hass_entity_base, device_id, device_id) local hass_temp = string.format('{%s,"name":"Temperature","object_id":"%s_temperature","unique_id":"%s_temperature","device_class":"temperature","unit_of_measurement":"°c","value_template":"{{value_json.temperature_degc}}"}', hass_entity_base, device_id, device_id) local hass_humi = string.format('{%s,"name":"Humidity","object_id":"%s_humidity","unique_id":"%s_humidity","device_class":"humidity","unit_of_measurement":"%%","value_template":"{{value_json.humidity_relpercent}}"}', hass_entity_base, device_id, device_id) local hass_rssi = string.format('{%s,"name":"RSSI","object_id":"%s_rssi","unique_id":"%s_rssi","device_class":"signal_strength","unit_of_measurement":"dBm","value_template":"{{value_json.rssi_dbm}}","entity_category":"diagnostic"}', hass_entity_base, device_id, device_id) mqttclient:publish("homeassistant/sensor/" .. device_id .. "/co2/config", hass_co2, 0, 1, function(client) mqttclient:publish("homeassistant/sensor/" .. device_id .. "/temperature/config", hass_temp, 0, 1, function(client) mqttclient:publish("homeassistant/sensor/" .. device_id .. "/humidity/config", hass_humi, 0, 1, function(client) mqttclient:publish("homeassistant/sensor/" .. device_id .. "/rssi/config", hass_rssi, 0, 1, function(client) collectgarbage() setup_client() end) end) end) end) end watchdog:register(180 * 1000, tmr.ALARM_SEMI, node.restart) push_timer:register(20 * 1000, tmr.ALARM_AUTO, push_data) watchdog:start() connect_wifi()