--
-- s t a t e _ j
--
-- Transmit the sensor data via HTTP.
--
function state_j()
 
    -- The HTTP/1.1 string is added by the NodeMCU HTTP library.
    -- Adding it to the URL doesn't show up on a Grovestreams API
    -- check, but the last data value is dropped without warning.
    -- The HTTP library also adds a "Connection: close" header.
 
    local url = {
        "http://grovestreams.com/api/feed?",
        "&compTmplId=temp",
        "&compId=" .. GS_ID,
        "&org=" .. GS_UUID,
        "&api_key=" .. GS_PUT_KEY,
        "",
        "",
        "",
        ""
        }
    --  " HTTP/1.1\r\n"
 
    local headers = {
        "Accept-Encoding: identityrn",
        "Content-Length: 0rn",
        "Host: grovestreams.comrn",
        "Connection: closern",
        "rnrn"
        }
 
    -- There are at most four sensors.
    -- local t = string.format("&therm%d=%s%u.%02u", id, s, b, c)
    for idx = 1, #Sensors
    do
        local t = Sensors[idx].gettherm()
        if t ~= nil
        then
            url[idx + 5] = t
        end
    end
 
    -- Send the data to GroveStreams.
    http.put(table.concat(url), table.concat(headers), "",
        function(code, data)
            -- Check the network and HTTP return codes.
            -- Recovery from network errors is rare.
            if code < 0
            then
                set_led(Red)
                print("Network error: " .. code)
            elseif code ~= 200
            then
                set_led(Red)
                print("HTTP error code: " .. code)
            else
                set_led(Green)
                print("HTTP code: " .. code)
            end
 
        end)
end