broadcast_env.lua

BROADCAST_PORT = 65000

SDA, SCL = 3, 4
i2c.setup(0, SDA, SCL, i2c.SLOW) -- call i2c.setup() only once
bme280.setup()

function get_iso_time()
    tm = rtctime.epoch2cal(rtctime.get())
    timestr = string.format("%04d-%02d-%02dT%02d:%02d:%02dZ", tm["year"], tm["mon"], tm["day"], tm["hour"], tm["min"], tm["sec"])

    return timestr
end

sntp.sync( nil, function()
    uskt = net.createUDPSocket()

    tmr.create():alarm( 5000, tmr.ALARM_AUTO, function(mytmr)
--[[
        local P, T = bme280.baro()
        P = P/1000
        T = T/100

        local H = bme280.humi()
        H = H/1000

        envjson = "{\"temp\":" .. T .. ", \"humi\":" .. H .. ", \"baro\":" .. P .. ", \"time\":\"" .. get_iso_time() .. "\"}"

        -- Switch back to UDP?
        local udp = net.createUDPSocket()
        udp:send(BROADCAST_PORT, wifi.sta.getbroadcast(), envjson)
        udp:close()

        -- MQTT is reliable but apparently unnecessary since
        -- D-Bus is being used anyway.
        local mq = mqtt.Client("nursery", 120)
        mq:connect("thegaspers.org", function(mc)
            mc:publish("gasperhome/nursery", envjson, 0, 1, function(mc)
                mc:close()
            end)
        end)
]]
    end)
end)