diff options
Diffstat (limited to 'init.lua')
-rw-r--r-- | init.lua | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/init.lua b/init.lua new file mode 100644 index 0000000..76b8225 --- /dev/null +++ b/init.lua @@ -0,0 +1,118 @@ +station_cfg = {} +publishing_mqtt = false +publishing_http = false + +watchdog = 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("ESP8266 " .. chip_id) + +ledpin = 4 +gpio.mode(ledpin, gpio.OUTPUT) +gpio.write(ledpin, 0) + +mhz19 = require("mh-z19") + +poll = tmr.create() + +function log_restart() + print("Network error " .. wifi.sta.status()) +end + +function setup_client() + print("Connected") + gpio.write(ledpin, 1) + port = softuart.setup(9600, 1, 2) + port:on("data", 9, uart_callback) + publishing_mqtt = true + mqttclient:publish(mqtt_prefix .. "/state", "online", 0, 1, function(client) + publishing_mqtt = false + query_data() + poll:start() + 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 uart_callback(data) + if not mhz19.parse_frame(data) then + print("Invalid MH-Z19 frame") + return + end + + local json_str = string.format('{"rssi_dbm":%d,"co2_ppm":"%d"}', wifi.sta.getrssi(), mhz19.co2) + local influx_str = string.format("co2_ppm=%d", mhz19.co2) + + if not publishing_mqtt then + watchdog:start(true) + publishing_mqtt = 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 + +function publish_influx(payload) + if not publishing_http then + publishing_http = true + http.post(influx_url, influx_header, "mh_z19" .. influx_attr .. " " .. payload, function(code, data) + publishing_http = false + gpio.write(ledpin, 1) + collectgarbage() + end) + end +end + +function query_data() + port:write(mhz19.query()) +end + +function hass_register() + local hass_device = string.format('{"connections":[["mac","%s"]],"identifiers":["%s"],"model":"ESP8266 + MH-Z19","name":"MH-Z19 %s","manufacturer":"derf"}', wifi.sta.getmac(), device_id, chip_id) + local hass_entity_base = string.format('"device":%s,"state_topic":"%s/data","expire_after":120', 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_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 .. "/rssi/config", hass_rssi, 0, 1, function(client) + collectgarbage() + setup_client() + end) + end) +end + +watchdog:register(180 * 1000, tmr.ALARM_SEMI, node.restart) +poll:register(20 * 1000, tmr.ALARM_AUTO, query_data) +watchdog:start() + +connect_wifi() |