diff --git a/tclcheck_allfull.py b/tclcheck_allfull.py
index 6922991..a277a9f 100644
--- a/tclcheck_allfull.py
+++ b/tclcheck_allfull.py
@@ -6,6 +6,7 @@
 import sys
 import tcllib
 import tcllib.argparser
+from tcllib import ansi
 from requests.exceptions import RequestException, Timeout
 
 tcllib.make_escapes_work()
@@ -46,8 +47,8 @@ for prd, variant in prds.items():
             txt_tv = tv
             if tv != lastver:
                 txt_tv = "{} (old: {} / OTA: {})".format(
-                    tcllib.ANSI_CYAN + txt_tv + tcllib.ANSI_RESET,
-                    tcllib.ANSI_CYAN_DARK + variant["last_full"] + tcllib.ANSI_RESET,
+                    ansi.CYAN + txt_tv + ansi.RESET,
+                    ansi.CYAN_DARK + variant["last_full"] + ansi.RESET,
                     variant["last_ota"]
                 )
             else:
diff --git a/tclcheck_allota.py b/tclcheck_allota.py
index 598155f..5e7b754 100644
--- a/tclcheck_allota.py
+++ b/tclcheck_allota.py
@@ -8,6 +8,7 @@ import requests
 import sys
 import tcllib
 import tcllib.argparser
+from tcllib import ansi
 from requests.exceptions import RequestException
 
 tcllib.make_escapes_work()
@@ -52,7 +53,7 @@ for prd, variant in prds.items():
             fc.fv = lastver
             check_xml = fc.do_check(max_tries=20)
             curef, fv, tv, fw_id, fileid, fn, fsize, fhash = fc.parse_check(check_xml)
-            versioninfo = tcllib.ANSI_YELLOW_DARK + fv + tcllib.ANSI_RESET + " ⇨ " + tcllib.ANSI_YELLOW + tv + tcllib.ANSI_RESET + " (FULL: {})".format(variant["last_full"])
+            versioninfo = ansi.YELLOW_DARK + fv + ansi.RESET + " ⇨ " + ansi.YELLOW + tv + ansi.RESET + " (FULL: {})".format(variant["last_full"])
             print("{}: {} {} ({})".format(prd, versioninfo, fhash, model))
         except RequestException as e:
             print("{} ({}): {}".format(prd, lastver, str(e)))
diff --git a/tclcheck_findprd.py b/tclcheck_findprd.py
index 490207e..82c9431 100755
--- a/tclcheck_findprd.py
+++ b/tclcheck_findprd.py
@@ -7,6 +7,7 @@ import collections
 import sys
 import tcllib
 import tcllib.argparser
+from tcllib import ansi
 from requests.exceptions import RequestException, Timeout
 
 tcllib.make_escapes_work()
@@ -68,7 +69,7 @@ for center in sorted(prddict.keys()):
         curef = "PRD-{}-{:03}".format(center, j)
         done_count += 1
         print("Checking {} ({}/{})".format(curef, done_count, total_count))
-        print(tcllib.ANSI_UP_DEL, end="")
+        print(ansi.UP_DEL, end="")
         try:
             fc.reset_session()
             fc.curef = curef
diff --git a/tclcheck_findprd2.py b/tclcheck_findprd2.py
index 7b709df..dc4712a 100644
--- a/tclcheck_findprd2.py
+++ b/tclcheck_findprd2.py
@@ -7,6 +7,7 @@ import collections
 import sys
 import tcllib
 import tcllib.argparser
+from tcllib import ansi
 from requests.exceptions import RequestException, Timeout
 
 # Variants to scan for
@@ -56,7 +57,7 @@ for center in to_scan:
         curef = "PRD-{:05}-{:3}".format(center, j)
         done_count += 1
         print("Checking {} ({}/{})".format(curef, done_count, total_count))
-        print(tcllib.ANSI_UP_DEL, end="")
+        print(ansi.UP_DEL, end="")
         try:
             fc.reset_session()
             fc.curef = curef
diff --git a/tclcheck_findver.py b/tclcheck_findver.py
index fcbdc4e..d09627c 100755
--- a/tclcheck_findver.py
+++ b/tclcheck_findver.py
@@ -6,6 +6,7 @@
 import sys
 import tcllib
 import tcllib.argparser
+from tcllib import ansi
 from requests.exceptions import RequestException, Timeout
 
 tcllib.make_escapes_work()
@@ -54,7 +55,7 @@ total_count = len(allvers)
 for fv in allvers:
     done_count += 1
     print("Checking {} ({}/{})".format(fv, done_count, total_count))
-    print(tcllib.ANSI_UP_DEL, end="")
+    print(ansi.UP_DEL, end="")
     try:
         fc.reset_session()
         fc.fv = fv
diff --git a/tcllib/__init__.py b/tcllib/__init__.py
index 93ad56d..c60ec4e 100644
--- a/tcllib/__init__.py
+++ b/tcllib/__init__.py
@@ -2,43 +2,18 @@
 
 # pylint: disable=C0111,C0326
 
-import base64
-import binascii
 import enum
-import errno
-import glob
-import hashlib
-import json
-import os
 import platform
-import random
-import time
-import xml.dom.minidom
-import zlib
-from collections import OrderedDict
-from math import floor
-import numpy
 import requests
-from defusedxml import ElementTree
-
-DEVICELIST_URL = "https://tclota.birth-online.de/json_lastupdates.php"
-DEVICELIST_FILE = "prds.json"
-DEVICELIST_CACHE_SECONDS = 86400
-
-ANSI_UP_DEL = u"\u001b[F\u001b[K"
-ANSI_BLACK = u"\u001b[0;30m"
-ANSI_RED_DARK = u"\u001b[0;31m"
-ANSI_GREEN_DARK = u"\u001b[0;32m"
-ANSI_YELLOW_DARK = u"\u001b[0;33m"
-ANSI_CYAN_DARK = u"\u001b[0;36m"
-ANSI_SILVER = u"\u001b[0;37m"
-ANSI_GREY = u"\u001b[1;30m"
-ANSI_RED = u"\u001b[1;31m"
-ANSI_GREEN = u"\u001b[1;32m"
-ANSI_YELLOW = u"\u001b[1;33m"
-ANSI_CYAN = u"\u001b[1;36m"
-ANSI_WHITE = u"\u001b[1;37m"
-ANSI_RESET = u"\u001b[0m"
+from . import credentials
+from . import devlist
+from . import dumpmgr
+from . import servervote
+from . import tclcheck
+from . import tclrequest
+from . import tclchecksum
+from . import tclencheader
+from . import xmltools
 
 def make_escapes_work():
     system = platform.system()
@@ -54,7 +29,17 @@ def make_escapes_work():
 def default_enum(enumname, vardict):
     return enum.IntEnum(enumname, vardict, module=__name__, qualname="tcllib.FotaCheck.{}".format(enumname))
 
-class FotaCheck:
+class FotaCheck(
+    tclcheck.TclCheck,
+    tclrequest.TclRequest,
+    tclchecksum.TclChecksum,
+    tclencheader.TclEncHeader,
+    servervote.ServerVote,
+    credentials.Credentials,
+    devlist.DevList,
+    dumpmgr.DumpMgr,
+    xmltools.XmlTools
+    ):
     VDKEY = b"eJwdjwEOwDAIAr8kKFr//7HhmqXp8AIIDrYAgg8byiUXrwRJRXja+d6iNxu0AhUooDCN9rd6rDLxmGIakUVWo3IGCTRWqCAt6X4jGEIUAxgN0eYWnp+LkpHQAg/PsO90ELsy0Npm/n2HbtPndFgGEV31R9OmT4O4nrddjc3Qt6nWscx7e+WRHq5UnOudtjw5skuV09pFhvmqnOEIs4ljPeel1wfLYUF4\n"
     CKTP = default_enum("CKTP", ["AUTO", "MANUAL"])
     MODE = default_enum("MODE", {"OTA": 2, "FULL": 4})
@@ -98,340 +83,3 @@ class FotaCheck:
         else:
             self.sess.headers.update({"User-Agent": "tcl"})
         return self.sess
-
-    @staticmethod
-    def get_salt():
-        millis = floor(time.time() * 1000)
-        tail = "{:06d}".format(random.randint(0, 999999))
-        return "{}{}".format(str(millis), tail)
-
-    def get_master_server(self):
-        weight_sum = 0
-        for i in self.master_servers_weights:
-            weight_sum += i
-        numpy_weights = []
-        for i in self.master_servers_weights:
-            numpy_weights.append(i/weight_sum)
-        return numpy.random.choice(self.master_servers, p=numpy_weights)
-
-    def master_server_downvote(self):
-        idx = self.master_servers.index(self.g2master)
-        if self.master_servers_weights[idx] > 1:
-            self.master_servers_weights[idx] -= 1
-
-    def master_server_upvote(self):
-        idx = self.master_servers.index(self.g2master)
-        if self.master_servers_weights[idx] < 10:
-            self.master_servers_weights[idx] += 1
-
-    def check_time_add(self, duration):
-        self.check_time_sum += duration
-        self.check_time_count += 1
-
-    def check_time_avg(self):
-        return (self.check_time_sum / self.check_time_count)
-
-    def master_server_vote_on_time(self, last_duration, avg_duration):
-        if last_duration < avg_duration - 0.5:
-            self.master_server_upvote()
-        elif last_duration > avg_duration + 0.5:
-            self.master_server_downvote()
-
-    def write_dump(self, data):
-        outfile = os.path.normpath("logs/{}.xml".format(self.get_salt()))
-        if not os.path.exists(os.path.dirname(outfile)):
-            try:
-                os.makedirs(os.path.dirname(outfile))
-            except OSError as e:
-                if e.errno != errno.EEXIST:
-                    raise
-        with open(outfile, "w", encoding="utf-8") as f:
-            f.write(data)
-        self.last_dump_filename = outfile
-
-    def delete_last_dump(self):
-        if self.last_dump_filename:
-            os.unlink(self.last_dump_filename)
-            self.last_dump_filename = None
-
-    @staticmethod
-    def write_info_if_dumps_found():
-        # To disable this info, uncomment the following line.
-        #return
-        files = glob.glob(os.path.normpath("logs/*.xml"))
-        if len(files) > 0:
-            print()
-            print("{}There are {} logs collected in the logs/ directory.{} Please consider uploading".format(ANSI_YELLOW, len(files), ANSI_RESET))
-            print("them to https://tclota.birth-online.de/ by running {}./upload_logs.py{}.".format(ANSI_CYAN, ANSI_RESET))
-
-    def do_check(self, https=True, timeout=10, max_tries=5):
-        protocol = "https://" if https else "http://"
-        url = protocol + self.g2master + "/check.php"
-        params = OrderedDict()
-        params["id"]    = self.serid
-        params["curef"] = self.curef
-        params["fv"]    = self.fv
-        params["mode"]  = self.mode.value
-        params["type"]  = self.ftype
-        params["cltp"]  = self.cltp.value
-        params["cktp"]  = self.cktp.value
-        params["rtd"]   = self.rtd.value
-        params["chnl"]  = self.chnl.value
-        #params["osvs"]  = self.osvs
-        #params["ckot"]  = self.ckot.value
-
-        last_response = None
-        for num_try in range(0, max_tries):
-            try:
-                reqtime_start = time.perf_counter()
-                req = self.sess.get(url, params=params, timeout=timeout)
-                reqtime = time.perf_counter() - reqtime_start
-                reqtime_avg = self.check_time_avg()
-                self.check_time_add(reqtime)
-                last_response = req
-                if req.status_code == 200:
-                    self.master_server_vote_on_time(reqtime, reqtime_avg)
-                    req.encoding = "utf-8"    # Force encoding as server doesn't give one
-                    self.write_dump(req.text)
-                    return req.text
-                elif req.status_code == 204:
-                    self.master_server_vote_on_time(reqtime, reqtime_avg)
-                    raise requests.exceptions.HTTPError("No update available.", response=req)
-                elif req.status_code == 404:
-                    self.master_server_vote_on_time(reqtime, reqtime_avg)
-                    raise requests.exceptions.HTTPError("No data for requested CUREF/FV combination.", response=req)
-                elif req.status_code not in [500, 502, 503]:
-                    self.master_server_downvote()
-                    req.raise_for_status()
-                    raise requests.exceptions.HTTPError("HTTP {}.".format(req.status_code), response=req)
-            except requests.exceptions.Timeout:
-                pass
-            # Something went wrong, try a different server
-            self.master_server_downvote()
-            self.g2master = self.get_master_server()
-            protocol = "https://" if https else "http://"
-            url = protocol + self.g2master + "/check.php"
-        raise requests.exceptions.RetryError("Max tries ({}) reached.".format(max_tries), response=last_response)
-
-    @staticmethod
-    def pretty_xml(xmlstr):
-        mdx = xml.dom.minidom.parseString(xmlstr)
-        return mdx.toprettyxml(indent="  ")
-
-    @staticmethod
-    def parse_check(xmlstr):
-        root = ElementTree.fromstring(xmlstr)
-        curef = root.find("CUREF").text
-        fv = root.find("VERSION").find("FV").text
-        tv = root.find("VERSION").find("TV").text
-        fw_id = root.find("FIRMWARE").find("FW_ID").text
-        fileinfo = root.find("FIRMWARE").find("FILESET").find("FILE")
-        fileid   = fileinfo.find("FILE_ID").text
-        filename = fileinfo.find("FILENAME").text
-        filesize = fileinfo.find("SIZE").text
-        filehash = fileinfo.find("CHECKSUM").text
-        return curef, fv, tv, fw_id, fileid, filename, filesize, filehash
-
-    def get_vk2(self, params_dict, cltp):
-        params_dict["cltp"] = cltp
-        query = ""
-        for k, v in params_dict.items():
-            if len(query) > 0:
-                query += "&"
-            query += k + "=" + str(v)
-        vdk = zlib.decompress(binascii.a2b_base64(self.VDKEY))
-        query += vdk.decode("utf-8")
-        engine = hashlib.sha1()
-        engine.update(bytes(query, "utf-8"))
-        hexhash = engine.hexdigest()
-        return hexhash
-
-    @staticmethod
-    def get_devicelist(force=False, output_diff=True):
-        need_download = True
-
-        old_prds = None
-        try:
-            filestat = os.stat(DEVICELIST_FILE)
-            filemtime = filestat.st_mtime
-            if filemtime > time.time() - DEVICELIST_CACHE_SECONDS:
-                need_download = False
-            with open(DEVICELIST_FILE, "rt") as df:
-                old_prds = json.load(df)
-        except FileNotFoundError:
-            pass
-
-        if need_download or force:
-            prds_json = requests.get(DEVICELIST_URL).text
-            with open(DEVICELIST_FILE, "wt") as df:
-                df.write(prds_json)
-
-        with open(DEVICELIST_FILE, "rt") as df:
-            prds = json.load(df)
-
-        if old_prds and output_diff:
-            FotaCheck.print_prd_diff(old_prds, prds)
-
-        return prds
-
-    @staticmethod
-    def print_prd_diff(old_prds, new_prds):
-        added_prds = [prd for prd in new_prds if prd not in old_prds]
-        removed_prds = [prd for prd in old_prds if prd not in new_prds]
-        for prd in removed_prds:
-            print("> Removed device {} (was at {} / OTA: {}).".format(ANSI_RED + prd + ANSI_RESET, old_prds[prd]["last_full"], old_prds[prd]["last_ota"]))
-        for prd in added_prds:
-            print("> New device {} ({} / OTA: {}).".format(ANSI_GREEN + prd + ANSI_RESET, new_prds[prd]["last_full"], new_prds[prd]["last_ota"]))
-        for prd, pdata in new_prds.items():
-            if prd in added_prds:
-                continue
-            odata = old_prds[prd]
-            if pdata["last_full"] != odata["last_full"] and pdata["last_ota"] != odata["last_ota"]:
-                print("> {}: {} ⇨ {} (OTA: {} ⇨ {})".format(
-                    prd,
-                    ANSI_CYAN_DARK + str(odata["last_full"]) + ANSI_RESET,
-                    ANSI_CYAN + str(pdata["last_full"]) + ANSI_RESET,
-                    ANSI_YELLOW_DARK + str(odata["last_ota"]) + ANSI_RESET,
-                    ANSI_YELLOW + str(pdata["last_ota"]) + ANSI_RESET
-                ))
-            elif pdata["last_full"] != odata["last_full"]:
-                print("> {}: {} ⇨ {} (FULL)".format(prd, ANSI_CYAN_DARK + str(odata["last_full"]) + ANSI_RESET, ANSI_CYAN + str(pdata["last_full"]) + ANSI_RESET))
-            elif pdata["last_ota"] != odata["last_ota"]:
-                print("> {}: {} ⇨ {} (OTA)".format(prd, ANSI_YELLOW_DARK + str(odata["last_ota"]) + ANSI_RESET, ANSI_YELLOW + str(pdata["last_ota"]) + ANSI_RESET))
-
-    @staticmethod
-    def get_creds():
-        creds = {
-            b"YWNjb3VudA==": b"emhlbmdodWEuZ2Fv",
-            b"cGFzc3dvcmQ=": b"cWFydUQ0b2s=",
-        }
-        params = {base64.b64decode(key): base64.b64decode(val) for key, val in creds.items()}
-        return params
-
-    @staticmethod
-    def get_creds2():
-        creds = {
-            b"YWNjb3VudA==": b"VGVsZUV4dFRlc3Q=",
-            b"cGFzc3dvcmQ=": b"dDA1MjM=",
-        }
-        params = {base64.b64decode(key): base64.b64decode(val) for key, val in creds.items()}
-        return params
-
-    '''
-        private HashMap<String, String> buildDownloadUrisParams(UpdatePackageInfo updatePackageInfo) {
-            FotaLog.m28v(TAG, "doAfterCheck");
-            String salt = FotaUtil.salt();
-            HashMap linkedHashMap = new LinkedHashMap();
-            linkedHashMap.put("id", this.internalBuilder.getParam("id"));
-            linkedHashMap.put("salt", salt);
-            linkedHashMap.put("curef", updatePackageInfo.mCuref);
-            linkedHashMap.put("fv", updatePackageInfo.mFv);
-            linkedHashMap.put("tv", updatePackageInfo.mTv);
-            linkedHashMap.put("type", "Firmware");
-            linkedHashMap.put("fw_id", updatePackageInfo.mFirmwareId);
-            linkedHashMap.put("mode", "2");
-            linkedHashMap.put("vk", generateVk2((LinkedHashMap) linkedHashMap.clone()));
-            linkedHashMap.put("cltp", "10");
-            linkedHashMap.put("cktp", this.internalBuilder.getParam("cktp"));
-            linkedHashMap.put("rtd", this.internalBuilder.getParam("rtd"));
-            linkedHashMap.put("chnl", this.internalBuilder.getParam("chnl"));
-            return linkedHashMap;
-        }
-    '''
-
-    def do_request(self, curef, fv, tv, fw_id):
-        url = "https://" + self.g2master + "/download_request.php"
-        params = OrderedDict()
-        params["id"]    = self.serid
-        params["salt"]  = self.get_salt()
-        params["curef"] = curef
-        params["fv"]    = fv
-        params["tv"]    = tv
-        params["type"]  = self.ftype
-        params["fw_id"] = fw_id
-        params["mode"]  = self.mode.value
-        params["vk"]    = self.get_vk2(params, self.cltp.value)
-        params["cltp"]  = self.cltp.value
-        params["cktp"]  = self.cktp.value
-        params["rtd"]   = self.rtd.value
-        if self.mode == self.MODE.FULL:
-            params["foot"]  = 1
-        params["chnl"]  = self.chnl.value
-
-        #print(repr(dict(params)))
-        req = self.sess.post(url, data=params)
-        if req.status_code == 200:
-            req.encoding = "utf-8"    # Force encoding as server doesn't give one
-            self.write_dump(req.text)
-            return req.text
-        else:
-            print("REQUEST: " + repr(req))
-            print(repr(req.headers))
-            print(repr(req.text))
-            raise SystemExit
-
-    @staticmethod
-    def parse_request(xmlstr):
-        root = ElementTree.fromstring(xmlstr)
-        file = root.find("FILE_LIST").find("FILE")
-        fileid  = file.find("FILE_ID").text
-        fileurl = file.find("DOWNLOAD_URL").text
-        s3_fileurl_node = file.find("S3_DOWNLOAD_URL")
-        s3_fileurl = ""
-        if s3_fileurl_node:
-            s3_fileurl = s3_fileurl_node.text
-        slave_list = root.find("SLAVE_LIST").findall("SLAVE")
-        enc_list = root.find("SLAVE_LIST").findall("ENCRYPT_SLAVE")
-        s3_slave_list = root.find("SLAVE_LIST").findall("S3_SLAVE")
-        slaves = [s.text for s in slave_list]
-        encslaves = [s.text for s in enc_list]
-        s3_slaves = [s.text for s in s3_slave_list]
-        return fileid, fileurl, slaves, encslaves, s3_fileurl, s3_slaves
-
-    def do_encrypt_header(self, encslave, address):
-        params = self.get_creds2()
-        params[b"address"] = bytes(address, "utf-8")
-        url = "http://" + encslave + "/encrypt_header.php"
-        req = self.sess.post(url, data=params, verify=False)
-        # Expect "HTTP 206 Partial Content" response
-        if req.status_code == 206:
-            return req.content
-        else:
-            print("ENCRYPT: " + repr(req))
-            print(repr(req.headers))
-            print(repr(req.text))
-            raise SystemExit
-
-    def do_checksum(self, encslave, address, uri):
-        url = "http://" + encslave + "/checksum.php"
-        params = self.get_creds2()
-
-        payload = {address: uri}
-        payload_json = json.dumps(payload)
-        params[b"address"]  = bytes(payload_json, "utf-8")
-
-        #print(repr(dict(params)))
-        req = self.sess.post(url, data=params)
-        if req.status_code == 200:
-            req.encoding = "utf-8"    # Force encoding as server doesn't give one
-            self.write_dump(req.text)
-            # <ENCRYPT_FOOTER>2abfa6f6507044fec995efede5d818e62a0b19b5</ENCRYPT_FOOTER> means ERROR (invalid ADDRESS!)
-            if "<ENCRYPT_FOOTER>2abfa6f6507044fec995efede5d818e62a0b19b5</ENCRYPT_FOOTER>" in req.text:
-                print("INVALID URI: {}".format(uri))
-                raise SystemExit
-            return req.text
-        else:
-            print("CHECKSUM: " + repr(req))
-            print(repr(req.headers))
-            print(repr(req.text))
-            raise SystemExit
-
-    @staticmethod
-    def parse_checksum(xmlstr):
-        root = ElementTree.fromstring(xmlstr)
-        file = root.find("FILE_CHECKSUM_LIST").find("FILE")
-        file_addr = file.find("ADDRESS").text
-        sha1_enc_footer = file.find("ENCRYPT_FOOTER").text
-        sha1_footer = file.find("FOOTER").text
-        sha1_body = file.find("BODY").text
-        return file_addr, sha1_body, sha1_enc_footer, sha1_footer
diff --git a/tcllib/ansi.py b/tcllib/ansi.py
new file mode 100644
index 0000000..590bfb8
--- /dev/null
+++ b/tcllib/ansi.py
@@ -0,0 +1,16 @@
+# -*- coding: utf-8 -*-
+
+UP_DEL = u"\u001b[F\u001b[K"
+BLACK = u"\u001b[0;30m"
+RED_DARK = u"\u001b[0;31m"
+GREEN_DARK = u"\u001b[0;32m"
+YELLOW_DARK = u"\u001b[0;33m"
+CYAN_DARK = u"\u001b[0;36m"
+SILVER = u"\u001b[0;37m"
+GREY = u"\u001b[1;30m"
+RED = u"\u001b[1;31m"
+GREEN = u"\u001b[1;32m"
+YELLOW = u"\u001b[1;33m"
+CYAN = u"\u001b[1;36m"
+WHITE = u"\u001b[1;37m"
+RESET = u"\u001b[0m"
diff --git a/tcllib/credentials.py b/tcllib/credentials.py
new file mode 100644
index 0000000..10ef96c
--- /dev/null
+++ b/tcllib/credentials.py
@@ -0,0 +1,22 @@
+# -*- coding: utf-8 -*-
+
+import base64
+
+class Credentials:
+    @staticmethod
+    def get_creds():
+        creds = {
+            b"YWNjb3VudA==": b"emhlbmdodWEuZ2Fv",
+            b"cGFzc3dvcmQ=": b"cWFydUQ0b2s=",
+        }
+        params = {base64.b64decode(key): base64.b64decode(val) for key, val in creds.items()}
+        return params
+
+    @staticmethod
+    def get_creds2():
+        creds = {
+            b"YWNjb3VudA==": b"VGVsZUV4dFRlc3Q=",
+            b"cGFzc3dvcmQ=": b"dDA1MjM=",
+        }
+        params = {base64.b64decode(key): base64.b64decode(val) for key, val in creds.items()}
+        return params
diff --git a/tcllib/devlist.py b/tcllib/devlist.py
new file mode 100644
index 0000000..a6d92be
--- /dev/null
+++ b/tcllib/devlist.py
@@ -0,0 +1,65 @@
+# -*- coding: utf-8 -*-
+
+import json
+import os
+import requests
+import time
+from . import ansi
+
+DEVICELIST_URL = "https://tclota.birth-online.de/json_lastupdates.php"
+DEVICELIST_FILE = "prds.json"
+DEVICELIST_CACHE_SECONDS = 86400
+
+class DevList:
+    @staticmethod
+    def get_devicelist(force=False, output_diff=True):
+        need_download = True
+
+        old_prds = None
+        try:
+            filestat = os.stat(DEVICELIST_FILE)
+            filemtime = filestat.st_mtime
+            if filemtime > time.time() - DEVICELIST_CACHE_SECONDS:
+                need_download = False
+            with open(DEVICELIST_FILE, "rt") as df:
+                old_prds = json.load(df)
+        except FileNotFoundError:
+            pass
+
+        if need_download or force:
+            prds_json = requests.get(DEVICELIST_URL).text
+            with open(DEVICELIST_FILE, "wt") as df:
+                df.write(prds_json)
+
+        with open(DEVICELIST_FILE, "rt") as df:
+            prds = json.load(df)
+
+        if old_prds and output_diff:
+            DevList.print_prd_diff(old_prds, prds)
+
+        return prds
+
+    @staticmethod
+    def print_prd_diff(old_prds, new_prds):
+        added_prds = [prd for prd in new_prds if prd not in old_prds]
+        removed_prds = [prd for prd in old_prds if prd not in new_prds]
+        for prd in removed_prds:
+            print("> Removed device {} (was at {} / OTA: {}).".format(ansi.RED + prd + ansi.RESET, old_prds[prd]["last_full"], old_prds[prd]["last_ota"]))
+        for prd in added_prds:
+            print("> New device {} ({} / OTA: {}).".format(ansi.GREEN + prd + ansi.RESET, new_prds[prd]["last_full"], new_prds[prd]["last_ota"]))
+        for prd, pdata in new_prds.items():
+            if prd in added_prds:
+                continue
+            odata = old_prds[prd]
+            if pdata["last_full"] != odata["last_full"] and pdata["last_ota"] != odata["last_ota"]:
+                print("> {}: {} ⇨ {} (OTA: {} ⇨ {})".format(
+                    prd,
+                    ansi.CYAN_DARK + str(odata["last_full"]) + ansi.RESET,
+                    ansi.CYAN + str(pdata["last_full"]) + ansi.RESET,
+                    ansi.YELLOW_DARK + str(odata["last_ota"]) + ansi.RESET,
+                    ansi.YELLOW + str(pdata["last_ota"]) + ansi.RESET
+                ))
+            elif pdata["last_full"] != odata["last_full"]:
+                print("> {}: {} ⇨ {} (FULL)".format(prd, ansi.CYAN_DARK + str(odata["last_full"]) + ansi.RESET, ansi.CYAN + str(pdata["last_full"]) + ansi.RESET))
+            elif pdata["last_ota"] != odata["last_ota"]:
+                print("> {}: {} ⇨ {} (OTA)".format(prd, ansi.YELLOW_DARK + str(odata["last_ota"]) + ansi.RESET, ansi.YELLOW + str(pdata["last_ota"]) + ansi.RESET))
diff --git a/tcllib/dumpmgr.py b/tcllib/dumpmgr.py
new file mode 100644
index 0000000..1be192a
--- /dev/null
+++ b/tcllib/dumpmgr.py
@@ -0,0 +1,34 @@
+# -*- coding: utf-8 -*-
+
+import errno
+import glob
+import os
+from . import ansi
+
+class DumpMgr:
+    def write_dump(self, data):
+        outfile = os.path.normpath("logs/{}.xml".format(self.get_salt()))
+        if not os.path.exists(os.path.dirname(outfile)):
+            try:
+                os.makedirs(os.path.dirname(outfile))
+            except OSError as e:
+                if e.errno != errno.EEXIST:
+                    raise
+        with open(outfile, "w", encoding="utf-8") as f:
+            f.write(data)
+        self.last_dump_filename = outfile
+
+    def delete_last_dump(self):
+        if self.last_dump_filename:
+            os.unlink(self.last_dump_filename)
+            self.last_dump_filename = None
+
+    @staticmethod
+    def write_info_if_dumps_found():
+        # To disable this info, uncomment the following line.
+        #return
+        files = glob.glob(os.path.normpath("logs/*.xml"))
+        if len(files) > 0:
+            print()
+            print("{}There are {} logs collected in the logs/ directory.{} Please consider uploading".format(ansi.YELLOW, len(files), ansi.RESET))
+            print("them to https://tclota.birth-online.de/ by running {}./upload_logs.py{}.".format(ansi.CYAN, ansi.RESET))
diff --git a/tcllib/servervote.py b/tcllib/servervote.py
new file mode 100644
index 0000000..405c727
--- /dev/null
+++ b/tcllib/servervote.py
@@ -0,0 +1,36 @@
+# -*- coding: utf-8 -*-
+
+import numpy
+
+class ServerVote:
+    def get_master_server(self):
+        weight_sum = 0
+        for i in self.master_servers_weights:
+            weight_sum += i
+        numpy_weights = []
+        for i in self.master_servers_weights:
+            numpy_weights.append(i/weight_sum)
+        return numpy.random.choice(self.master_servers, p=numpy_weights)
+
+    def master_server_downvote(self):
+        idx = self.master_servers.index(self.g2master)
+        if self.master_servers_weights[idx] > 1:
+            self.master_servers_weights[idx] -= 1
+
+    def master_server_upvote(self):
+        idx = self.master_servers.index(self.g2master)
+        if self.master_servers_weights[idx] < 10:
+            self.master_servers_weights[idx] += 1
+
+    def check_time_add(self, duration):
+        self.check_time_sum += duration
+        self.check_time_count += 1
+
+    def check_time_avg(self):
+        return (self.check_time_sum / self.check_time_count)
+
+    def master_server_vote_on_time(self, last_duration, avg_duration):
+        if last_duration < avg_duration - 0.5:
+            self.master_server_upvote()
+        elif last_duration > avg_duration + 0.5:
+            self.master_server_downvote()
diff --git a/tcllib/tclcheck.py b/tcllib/tclcheck.py
new file mode 100644
index 0000000..f370f44
--- /dev/null
+++ b/tcllib/tclcheck.py
@@ -0,0 +1,70 @@
+# -*- coding: utf-8 -*-
+
+import time
+from collections import OrderedDict
+import requests
+from defusedxml import ElementTree
+
+class TclCheck:
+    def do_check(self, https=True, timeout=10, max_tries=5):
+        protocol = "https://" if https else "http://"
+        url = protocol + self.g2master + "/check.php"
+        params = OrderedDict()
+        params["id"]    = self.serid
+        params["curef"] = self.curef
+        params["fv"]    = self.fv
+        params["mode"]  = self.mode.value
+        params["type"]  = self.ftype
+        params["cltp"]  = self.cltp.value
+        params["cktp"]  = self.cktp.value
+        params["rtd"]   = self.rtd.value
+        params["chnl"]  = self.chnl.value
+        #params["osvs"]  = self.osvs
+        #params["ckot"]  = self.ckot.value
+
+        last_response = None
+        for num_try in range(0, max_tries):
+            try:
+                reqtime_start = time.perf_counter()
+                req = self.sess.get(url, params=params, timeout=timeout)
+                reqtime = time.perf_counter() - reqtime_start
+                reqtime_avg = self.check_time_avg()
+                self.check_time_add(reqtime)
+                last_response = req
+                if req.status_code == 200:
+                    self.master_server_vote_on_time(reqtime, reqtime_avg)
+                    req.encoding = "utf-8"    # Force encoding as server doesn't give one
+                    self.write_dump(req.text)
+                    return req.text
+                elif req.status_code == 204:
+                    self.master_server_vote_on_time(reqtime, reqtime_avg)
+                    raise requests.exceptions.HTTPError("No update available.", response=req)
+                elif req.status_code == 404:
+                    self.master_server_vote_on_time(reqtime, reqtime_avg)
+                    raise requests.exceptions.HTTPError("No data for requested CUREF/FV combination.", response=req)
+                elif req.status_code not in [500, 502, 503]:
+                    self.master_server_downvote()
+                    req.raise_for_status()
+                    raise requests.exceptions.HTTPError("HTTP {}.".format(req.status_code), response=req)
+            except requests.exceptions.Timeout:
+                pass
+            # Something went wrong, try a different server
+            self.master_server_downvote()
+            self.g2master = self.get_master_server()
+            protocol = "https://" if https else "http://"
+            url = protocol + self.g2master + "/check.php"
+        raise requests.exceptions.RetryError("Max tries ({}) reached.".format(max_tries), response=last_response)
+
+    @staticmethod
+    def parse_check(xmlstr):
+        root = ElementTree.fromstring(xmlstr)
+        curef = root.find("CUREF").text
+        fv = root.find("VERSION").find("FV").text
+        tv = root.find("VERSION").find("TV").text
+        fw_id = root.find("FIRMWARE").find("FW_ID").text
+        fileinfo = root.find("FIRMWARE").find("FILESET").find("FILE")
+        fileid   = fileinfo.find("FILE_ID").text
+        filename = fileinfo.find("FILENAME").text
+        filesize = fileinfo.find("SIZE").text
+        filehash = fileinfo.find("CHECKSUM").text
+        return curef, fv, tv, fw_id, fileid, filename, filesize, filehash
diff --git a/tcllib/tclchecksum.py b/tcllib/tclchecksum.py
new file mode 100644
index 0000000..13fba15
--- /dev/null
+++ b/tcllib/tclchecksum.py
@@ -0,0 +1,39 @@
+# -*- coding: utf-8 -*-
+
+import json
+from defusedxml import ElementTree
+
+class TclChecksum:
+    def do_checksum(self, encslave, address, uri):
+        url = "http://" + encslave + "/checksum.php"
+        params = self.get_creds2()
+
+        payload = {address: uri}
+        payload_json = json.dumps(payload)
+        params[b"address"]  = bytes(payload_json, "utf-8")
+
+        #print(repr(dict(params)))
+        req = self.sess.post(url, data=params)
+        if req.status_code == 200:
+            req.encoding = "utf-8"    # Force encoding as server doesn't give one
+            self.write_dump(req.text)
+            # <ENCRYPT_FOOTER>2abfa6f6507044fec995efede5d818e62a0b19b5</ENCRYPT_FOOTER> means ERROR (invalid ADDRESS!)
+            if "<ENCRYPT_FOOTER>2abfa6f6507044fec995efede5d818e62a0b19b5</ENCRYPT_FOOTER>" in req.text:
+                print("INVALID URI: {}".format(uri))
+                raise SystemExit
+            return req.text
+        else:
+            print("CHECKSUM: " + repr(req))
+            print(repr(req.headers))
+            print(repr(req.text))
+            raise SystemExit
+
+    @staticmethod
+    def parse_checksum(xmlstr):
+        root = ElementTree.fromstring(xmlstr)
+        file = root.find("FILE_CHECKSUM_LIST").find("FILE")
+        file_addr = file.find("ADDRESS").text
+        sha1_enc_footer = file.find("ENCRYPT_FOOTER").text
+        sha1_footer = file.find("FOOTER").text
+        sha1_body = file.find("BODY").text
+        return file_addr, sha1_body, sha1_enc_footer, sha1_footer
diff --git a/tcllib/tclencheader.py b/tcllib/tclencheader.py
new file mode 100644
index 0000000..47e1a24
--- /dev/null
+++ b/tcllib/tclencheader.py
@@ -0,0 +1,16 @@
+# -*- coding: utf-8 -*-
+
+class TclEncHeader:
+    def do_encrypt_header(self, encslave, address):
+        params = self.get_creds2()
+        params[b"address"] = bytes(address, "utf-8")
+        url = "http://" + encslave + "/encrypt_header.php"
+        req = self.sess.post(url, data=params, verify=False)
+        # Expect "HTTP 206 Partial Content" response
+        if req.status_code == 206:
+            return req.content
+        else:
+            print("ENCRYPT: " + repr(req))
+            print(repr(req.headers))
+            print(repr(req.text))
+            raise SystemExit
diff --git a/tcllib/tclrequest.py b/tcllib/tclrequest.py
new file mode 100644
index 0000000..6bdc4fb
--- /dev/null
+++ b/tcllib/tclrequest.py
@@ -0,0 +1,102 @@
+# -*- coding: utf-8 -*-
+
+import binascii
+import hashlib
+import random
+import time
+from math import floor
+import zlib
+from collections import OrderedDict
+from defusedxml import ElementTree
+
+'''
+    private HashMap<String, String> buildDownloadUrisParams(UpdatePackageInfo updatePackageInfo) {
+        FotaLog.m28v(TAG, "doAfterCheck");
+        String salt = FotaUtil.salt();
+        HashMap linkedHashMap = new LinkedHashMap();
+        linkedHashMap.put("id", this.internalBuilder.getParam("id"));
+        linkedHashMap.put("salt", salt);
+        linkedHashMap.put("curef", updatePackageInfo.mCuref);
+        linkedHashMap.put("fv", updatePackageInfo.mFv);
+        linkedHashMap.put("tv", updatePackageInfo.mTv);
+        linkedHashMap.put("type", "Firmware");
+        linkedHashMap.put("fw_id", updatePackageInfo.mFirmwareId);
+        linkedHashMap.put("mode", "2");
+        linkedHashMap.put("vk", generateVk2((LinkedHashMap) linkedHashMap.clone()));
+        linkedHashMap.put("cltp", "10");
+        linkedHashMap.put("cktp", this.internalBuilder.getParam("cktp"));
+        linkedHashMap.put("rtd", this.internalBuilder.getParam("rtd"));
+        linkedHashMap.put("chnl", this.internalBuilder.getParam("chnl"));
+        return linkedHashMap;
+    }
+'''
+
+class TclRequest:
+    @staticmethod
+    def get_salt():
+        millis = floor(time.time() * 1000)
+        tail = "{:06d}".format(random.randint(0, 999999))
+        return "{}{}".format(str(millis), tail)
+
+    def get_vk2(self, params_dict, cltp):
+        params_dict["cltp"] = cltp
+        query = ""
+        for k, v in params_dict.items():
+            if len(query) > 0:
+                query += "&"
+            query += k + "=" + str(v)
+        vdk = zlib.decompress(binascii.a2b_base64(self.VDKEY))
+        query += vdk.decode("utf-8")
+        engine = hashlib.sha1()
+        engine.update(bytes(query, "utf-8"))
+        hexhash = engine.hexdigest()
+        return hexhash
+
+    def do_request(self, curef, fv, tv, fw_id):
+        url = "https://" + self.g2master + "/download_request.php"
+        params = OrderedDict()
+        params["id"]    = self.serid
+        params["salt"]  = self.get_salt()
+        params["curef"] = curef
+        params["fv"]    = fv
+        params["tv"]    = tv
+        params["type"]  = self.ftype
+        params["fw_id"] = fw_id
+        params["mode"]  = self.mode.value
+        params["vk"]    = self.get_vk2(params, self.cltp.value)
+        params["cltp"]  = self.cltp.value
+        params["cktp"]  = self.cktp.value
+        params["rtd"]   = self.rtd.value
+        if self.mode == self.MODE.FULL:
+            params["foot"]  = 1
+        params["chnl"]  = self.chnl.value
+
+        #print(repr(dict(params)))
+        req = self.sess.post(url, data=params)
+        if req.status_code == 200:
+            req.encoding = "utf-8"    # Force encoding as server doesn't give one
+            self.write_dump(req.text)
+            return req.text
+        else:
+            print("REQUEST: " + repr(req))
+            print(repr(req.headers))
+            print(repr(req.text))
+            raise SystemExit
+
+    @staticmethod
+    def parse_request(xmlstr):
+        root = ElementTree.fromstring(xmlstr)
+        file = root.find("FILE_LIST").find("FILE")
+        fileid  = file.find("FILE_ID").text
+        fileurl = file.find("DOWNLOAD_URL").text
+        s3_fileurl_node = file.find("S3_DOWNLOAD_URL")
+        s3_fileurl = ""
+        if s3_fileurl_node:
+            s3_fileurl = s3_fileurl_node.text
+        slave_list = root.find("SLAVE_LIST").findall("SLAVE")
+        enc_list = root.find("SLAVE_LIST").findall("ENCRYPT_SLAVE")
+        s3_slave_list = root.find("SLAVE_LIST").findall("S3_SLAVE")
+        slaves = [s.text for s in slave_list]
+        encslaves = [s.text for s in enc_list]
+        s3_slaves = [s.text for s in s3_slave_list]
+        return fileid, fileurl, slaves, encslaves, s3_fileurl, s3_slaves
diff --git a/tcllib/xmltools.py b/tcllib/xmltools.py
new file mode 100644
index 0000000..9cc8fc4
--- /dev/null
+++ b/tcllib/xmltools.py
@@ -0,0 +1,9 @@
+# -*- coding: utf-8 -*-
+
+import xml.dom.minidom
+
+class XmlTools:
+    @staticmethod
+    def pretty_xml(xmlstr):
+        mdx = xml.dom.minidom.parseString(xmlstr)
+        return mdx.toprettyxml(indent="  ")