{"id":1937,"date":"2018-02-14T22:56:53","date_gmt":"2018-02-14T20:56:53","guid":{"rendered":"https:\/\/einstein.amsterdam\/?page_id=1937"},"modified":"2018-02-14T22:56:53","modified_gmt":"2018-02-14T20:56:53","slug":"domoticz-metar-script","status":"publish","type":"page","link":"https:\/\/einstein.amsterdam\/?page_id=1937","title":{"rendered":"Domoticz METAR Script"},"content":{"rendered":"

Metar script
\nLua time script<\/p>\n

— METAR time script<\/p>\n

local idx = 103
\nlocal station = “EHAM”<\/p>\n

command = “curl http:\/\/tgftp.nws.noaa.gov\/data\/observations\/metar\/stations\/” .. station .. “.TXT”
\ncommandArray = {}<\/p>\n

local m = os.date(‘%M’)
\nif (m % 30 == 5) then
\n — update at 5 and 35 minutes of every hour
\n local handle = io.popen(command)
\n local data = handle:read(“*a”)
\n handle:close()<\/p>\n

if (data == ”) then
\n print(“Error metar data not fetched”)
\n return
\n end<\/p>\n

data = string.gsub(data, “M”, “-“)
\n local pres = tonumber(string.match(data, ‘ Q([0-9]+)’))
\n local temp = tonumber(string.match(data, ‘ ([-0-9]+)\/[-0-9]+ ‘))
\n local dew = tonumber(string.match(data, ‘ [-0-9]+\/([-0-9]+) ‘))
\n local fore = 5<\/p>\n

— very basic prediction
\n if (pres < 1000) then\n fore = 4\n elseif (pres < 1020) then\n fore = 3\n elseif (pres < 1030) then\n fore = 2\n else \n fore = 1\n end\n -- print (data, pres, temp)\n local hum = 100*(math.exp((17.625*dew)\/(243.04+dew))\/math.exp((17.625*temp)\/(243.04+temp))) \n \n \n commandArray[1] = {['UpdateDevice'] = idx .. '|0|' .. temp .. ';' .. hum .. ';0;' .. pres .. ';' .. fore}\nend\n\nreturn commandArray<\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"

Metar script Lua time script — METAR time script local idx = 103 local station = “EHAM” command = “curl http:\/\/tgftp.nws.noaa.gov\/data\/observations\/metar\/stations\/” .. station .. “.TXT” […]<\/a><\/p>\n<\/div>","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"_links":{"self":[{"href":"https:\/\/einstein.amsterdam\/index.php?rest_route=\/wp\/v2\/pages\/1937"}],"collection":[{"href":"https:\/\/einstein.amsterdam\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/einstein.amsterdam\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/einstein.amsterdam\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/einstein.amsterdam\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1937"}],"version-history":[{"count":1,"href":"https:\/\/einstein.amsterdam\/index.php?rest_route=\/wp\/v2\/pages\/1937\/revisions"}],"predecessor-version":[{"id":1938,"href":"https:\/\/einstein.amsterdam\/index.php?rest_route=\/wp\/v2\/pages\/1937\/revisions\/1938"}],"wp:attachment":[{"href":"https:\/\/einstein.amsterdam\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1937"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}