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station_cfg = {}
dofile("config.lua")
delayed_restart = tmr.create()
chipid = node.chipid()
mqtt_prefix = "sensor/esp8266_" .. chipid
mqttclient = mqtt.Client("esp8266_" .. chipid, 120)
print("ESP8266 " .. chipid)
ledpin = 4
gpio.mode(ledpin, gpio.OUTPUT)
gpio.write(ledpin, 0)
sds011 = require("sds011")
function log_restart()
print("Network error " .. wifi.sta.status() .. ". Restarting in 20 seconds.")
delayed_restart:start()
end
function setup_client()
gpio.write(ledpin, 1)
publishing = true
mqttclient:publish(mqtt_prefix .. "/state", "online", 0, 1, function(client)
publishing = false
end)
port = softuart.setup(9600, 2, 1)
port:on("data", 10, uart_callback)
end
function connect_mqtt()
print("IP address: " .. wifi.sta.getip())
print("Connecting to MQTT " .. mqtt_host)
delayed_restart:stop()
mqttclient:on("connect", setup_client)
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)
local pm25i, pm25f, pm10i, pm10f = sds011.parse_frame(data)
if pm25i == nil then
print("Invalid or data-less SDS011 frame")
return
end
local json_str = string.format('{"pm25_ugm3": %d.%d, "pm10_ugm3": %d.%d, "rssi_dbm": %d}', pm25i, pm25f, pm10i, pm10f, wifi.sta.getrssi())
if not publishing then
publishing = true
gpio.write(ledpin, 0)
mqttclient:publish(mqtt_prefix .. "/data", json_str, 0, 0, function(client)
publishing = false
gpio.write(ledpin, 1)
collectgarbage()
end)
end
end
delayed_restart:register(20 * 1000, tmr.ALARM_SINGLE, node.restart)
connect_wifi()
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