====== Access from WebHMI itself ======

To access the WebHMI DB data via API, you have to generate API key in the setup menu and use it in your requests. 
You can use //localhost// address as a part of the resource address. 

{{ :api:setup-menu-api-key.png?direct |}}

{{ :api:api-key-example.png?direct&800 |}}

===== Getting meter data example =====

<code lua>
function getMeterData(startTime, endTime) 
    
    local c = cURL.easy_init()
    c : setopt{ url = 'http://127.0.0.1/api/meters-log/',
              timeout = 15, 
              httpheader = { 'X-WH-APIKEY: 4025D32205ADC52E8604690FFADFB4600B8D41AA',
                             'X-WH-START: ' .. startTime, 
                             'X-WH-END: ' ..   endTime, 
                            
                             'Accept: application/json',
                             'Content-Type: application/json'
                            }
         }
 
    local res = ""
    c:perform{writefunction = function(str)
            res = res .. str
        end}
    c : close()
 
    if (res == '') or (res == '%[%]')then 
        ERROR('No data in response!') 
        return false 
    else 
        DEBUG(res)
        return res 
    end
    
end
</code>

===== Getting graph data example  =====
<code lua>
function getGraphData(regId, startTime, endTime) 
    
    local c = cURL.easy_init()
    c : setopt{ url = 'http://127.0.0.1/api/graph-data/',
              timeout = 15, 
               httpheader = {'X-WH-APIKEY: 9833A5C553C5E05D944C28615EB252A6CB2E9322',
                             'X-WH-START: ' .. startTime, 
                             'X-WH-END: ' ..   endTime, 
                             'X-WH-SLICES: ' ..   30, 
                             'X-WH-REGISTERS: ' ..   regId, 
                             
                             'Accept: application/json',
                             'Content-Type: application/json'
                            }
         }
 
    local res = ""
    c:perform{writefunction = function(str)
            res = res .. str
        end}
    c : close()
 
    if (res == '') or (res == '%[%]')then 
        ERROR('No data in response!') 
        return false 
    else 
        return res 
    end
    
end
</code>