Prometheus Exporter for Homematic CCU

prometheus.cgi

#!/bin/tclsh

load tclrega.so
source [file join $env(DOCUMENT_ROOT) once.tcl]
source [file join $env(DOCUMENT_ROOT) cgi.tcl]

cgi_eval {
    cgi_input
    cgi_content_type "text/plain; charset=iso-8859-1; version=0.0.4"

    set list ""
    catch { import list }

    array set res [rega_script {

string s_device;
object o_device;

string s_channel;
object o_channel;

string s_dp;
object o_dp;

foreach(s_device, dom.GetObject(ID_DEVICES).EnumUsedIDs()) {
    var o_device = dom.GetObject(s_device);
    if ((o_device.Address() != "BidCoS-Wir") && (o_device.Address() != "BidCoS-RF")) {
        ! WriteLine(o_device.Address() # " " # o_device.HssType() # " (" # o_device.Name() # ")");

        foreach(s_channel, o_device.Channels().EnumUsedIDs()) {
            o_channel = dom.GetObject(s_channel);

            foreach (s_dp, o_channel.DPs().EnumUsedIDs()) {
                o_dp = dom.GetObject(s_dp);

                integer val_tp = o_dp.ValueType();
                string val_str;

                if (val_tp == 2) {
                    if (o_dp.Value()) {
                        val_str = "1";
                    } else {
                        val_str = "0";
                    }
                } else {
                    val_str = o_dp.Value().ToString();
                }

                if (val_str.Length() > 0) {
                    WriteLine("homematic_dp_value{"
                        #      "channel_id=\"" # s_channel
                        # "\", dev_address=\"" # o_device.Address()
                        # "\", dev_hss_type=\"" # o_device.HssType()
                        # "\", dev_hss_type_name=\"" # o_device.TypeName()
                        # "\", dev_interface=\"" # o_device.Interface()
                        # "\", dev_name=\"" # o_device.Name()
                        # "\", dp_id=\"" # s_dp
                        # "\", dp_type=\"" # val_tp
                        # "\", dp_hss_type=\"" # o_dp.HssType()
                        # "\", dp_hss_type_name=\"" # o_dp.TypeName()
                        # "\"} " # val_str )
                }
            }
        }
    }
}


    }]
    set response [string map {\r\n \n} $res(STDOUT)]
    puts $response
}

I have an issue when "val_tp == 20" (RGBW) then the val_str is rgb(255,255,255,255) and prometheus fails during scraping and no value will be stored.
i just added this to line 45 and 46:
} elseif (val_tp == 20) {
val_str = "0";