diff --git a/packages/modules/smarthome/avmhomeautomation/avmcommon.py b/packages/modules/smarthome/avmhomeautomation/avmcommon.py
index 8124f3d2c1..4dd27c5c94 100644
--- a/packages/modules/smarthome/avmhomeautomation/avmcommon.py
+++ b/packages/modules/smarthome/avmhomeautomation/avmcommon.py
@@ -42,9 +42,8 @@ def __init__(self):
         if os.path.isfile(CACHEFILE):
             self.logMessage(LOGLEVELDEBUG, "found an AVM cache file, trying to load")
             try:
-                f = open(CACHEFILE, 'r')
-                self.cache = json.loads(f.read().strip())
-                f.close()
+                with open(CACHEFILE, 'r') as f:
+                    self.cache = json.loads(f.read().strip())
             except Exception as e:
                 self.logMessage(LOGLEVELDEBUG, "unable to load cache file: %s" % (e))
 
@@ -65,9 +64,8 @@ def writeCacheToRamdisk(self):
                 else:
                     cacheToWrite[login] = self.cache[login]
         try:
-            f = open(CACHEFILE, 'w')
-            json.dump(cacheToWrite, f)
-            f.close()
+            with open(CACHEFILE, 'w') as f:
+                json.dump(cacheToWrite, f)
         except Exception as e:
             self.logMessage(LOGLEVELDEBUG, "unable to write cache file: %s" % (e))
 
@@ -166,28 +164,7 @@ def connect(self):
 
     # logMessage writes a message to the logfile for the smarthome device.
     def logMessage(self, level, message):
-        if level < self.loglevel:
-            return
-        now = time.localtime()  # getstruct_time
-        time_string = time.strftime("%Y-%m-%d %H:%M:%S", now)
-        logfile_string = '/var/www/html/openWB/ramdisk/smarthome.log'
-        try:
-            if os.path.isfile(logfile_string):
-                f = open(logfile_string, 'a', encoding='utf8')
-            else:
-                f = open(logfile_string, 'w', encoding='utf8')
-            prefix = ""
-            if level == LOGLEVELDEBUG:
-                prefix = "[DEBUG] "
-            if level == LOGLEVELINFO:
-                prefix = "[INFO] "
-            if level == LOGLEVELERROR:
-                prefix = "[ERROR] "
-            log.debug('%s: (%s) AVM (actor: %s) %s%s' %
-                      (time_string, self.devicenumber, self.switchname, prefix, message), file=f)
-            f.close()
-        except IOError:
-            pass
+        log.debug(f'({self.devicenumber}) AVM (actor: {self.switchname}) {message}')
 
     # getDevicesDict returns a dictionary that maps defined actor names to its
     # unique hardware ID (called "AIN": "Actuator Identification Number") and
@@ -362,9 +339,8 @@ def getActualPower(self):
         outFileString = '/var/www/html/openWB/ramdisk/smarthome_device_ret' + str(self.devicenumber)
         self.logMessage(LOGLEVELDEBUG, "handing answer back to smarthomehandler via %s" % (outFileString))
         try:
-            f1 = open(outFileString, 'w')
-            json.dump(answer, f1)
-            f1.close()
+            with open(outFileString, 'w') as f1:
+                json.dump(answer, f1)
         except IOError as e:
             self.logMessage(LOGLEVELERROR, "error writing power result %s" % (e))
             log.debug(answer)  # dump answer to stdout if file cannot be written
diff --git a/packages/modules/smarthome/fronius/watt.py b/packages/modules/smarthome/fronius/watt.py
index ca0eb4e505..9f805c35b8 100644
--- a/packages/modules/smarthome/fronius/watt.py
+++ b/packages/modules/smarthome/fronius/watt.py
@@ -1,9 +1,12 @@
 #!/usr/bin/python3
+import logging
 import sys
 import json
 import jq
 import urllib.request
 
+log = logging.getLogger(__name__)
+
 devicenumber = str(sys.argv[1])
 ipadr = str(sys.argv[2])  # IP-ADresse des Fronius Wechselrichters, mit dem der Zähler kommuniziert
 smid = int(sys.argv[3])  # ID des Zählers im Wechselrichter (Hauptzähler 0, weitere fortlaufend)
@@ -27,7 +30,4 @@
 except Exception:
     powerc = 0
 
-f1 = open('/var/www/html/openWB/ramdisk/smarthome_device_ret' + str(devicenumber), 'w')
-answer = '{"power":' + str(power) + ',"powerc":' + str(powerc) + '}'
-json.dump(answer, f1)
-f1.close()
+log.debug("Device" + str(devicenumber) + '{"power":' + str(power) + ',"powerc":' + str(powerc) + '}')
diff --git a/packages/modules/smarthome/json/watt.py b/packages/modules/smarthome/json/watt.py
index efe2381ad9..a5131ee715 100644
--- a/packages/modules/smarthome/json/watt.py
+++ b/packages/modules/smarthome/json/watt.py
@@ -1,9 +1,12 @@
 #!/usr/bin/python3
+import logging
 import sys
 import json
 import jq
 import urllib.request
 
+log = logging.getLogger(__name__)
+
 devicenumber = str(sys.argv[1])
 # Abfrage-URL, die die .json Antwort liefert. Z.B.
 # "http://192.168.0.150/solar_api/v1/GetMeterRealtimeData.cgi?Scope=Device&DeviceID=1"
@@ -26,7 +29,4 @@
 except Exception:
     powerc = 0
 
-f1 = open('/var/www/html/openWB/ramdisk/smarthome_device_ret' + str(devicenumber), 'w')
-answer = '{"power":' + str(power) + ',"powerc":' + str(powerc) + '}'
-json.dump(answer, f1)
-f1.close()
+log.debug('Device' + str(devicenumber) + '{"power":' + str(power) + ',"powerc":' + str(powerc) + '}')
diff --git a/packages/modules/smarthome/mqtt/off.py b/packages/modules/smarthome/mqtt/off.py
index d7cea04010..672f1e9c28 100644
--- a/packages/modules/smarthome/mqtt/off.py
+++ b/packages/modules/smarthome/mqtt/off.py
@@ -35,6 +35,5 @@ def on_message(client, userdata, msg) -> None:
 client.disconnect()
 file_stringpv = '/var/www/html/openWB/ramdisk/smarthome_device_' + str(devicenumber) + '_pv'
 pvmodus = 0
-f = open(file_stringpv, 'w')
-f.write(str(pvmodus))
-f.close()
+with open(file_stringpv, 'w') as f:
+    f.write(str(pvmodus))
diff --git a/packages/modules/smarthome/mqtt/on.py b/packages/modules/smarthome/mqtt/on.py
index b5f70ed825..781d850a81 100644
--- a/packages/modules/smarthome/mqtt/on.py
+++ b/packages/modules/smarthome/mqtt/on.py
@@ -34,6 +34,5 @@ def on_message(client, userdata, msg) -> None:
 client.loop(timeout=2.0)
 client.disconnect()
 file_stringpv = '/var/www/html/openWB/ramdisk/smarthome_device_' + str(devicenumber) + '_pv'
-f = open(file_stringpv, 'w')
-f.write(str(1))
-f.close()
+with open(file_stringpv, 'w') as f:
+    f.write(str(1))
diff --git a/packages/modules/smarthome/mqtt/watt.py b/packages/modules/smarthome/mqtt/watt.py
index d590c36417..d1cb945fbc 100644
--- a/packages/modules/smarthome/mqtt/watt.py
+++ b/packages/modules/smarthome/mqtt/watt.py
@@ -69,9 +69,8 @@ def on_message(client, userdata, msg) -> None:
 # PV-Modus
 pvmodus = 0
 if os.path.isfile(file_stringpv):
-    f = open(file_stringpv, 'r')
-    pvmodus = int(f.read())
-    f.close()
+    with open(file_stringpv, 'r') as f:
+        pvmodus = int(f.read())
 answer = '{"power":' + str(aktpower) + ',"powerc":' + str(powerc)
 answer += ',"on":' + str(pvmodus) + ',"temp0":' + str(tempa)
 answer += ',"temp1":' + str(tempb) + ',"temp2":' + str(tempc) + '}'
diff --git a/packages/modules/smarthome/mystrom/watt.py b/packages/modules/smarthome/mystrom/watt.py
index 3ae83cf393..e58764e96b 100644
--- a/packages/modules/smarthome/mystrom/watt.py
+++ b/packages/modules/smarthome/mystrom/watt.py
@@ -1,9 +1,12 @@
 #!/usr/bin/python3
+import logging
 import sys
 import time
 import json
 import urllib.request
 
+log = logging.getLogger(__name__)
+
 named_tuple = time.localtime()  # getstruct_time
 time_string = time.strftime("%m/%d/%Y, %H:%M:%S mystrom watty.py", named_tuple)
 devicenumber = str(sys.argv[1])
@@ -21,6 +24,5 @@
 powerc = 0
 answer = '{"power":' + str(aktpower) + ',"powerc":' + str(powerc) + ',"on":' + \
     str(relais) + ',"temp0":' + str(temp) + '} '
-f1 = open('/var/www/html/openWB/ramdisk/smarthome_device_ret' + str(devicenumber), 'w')
-json.dump(answer, f1)
-f1.close()
+with open('/var/www/html/openWB/ramdisk/smarthome_device_ret' + str(devicenumber), 'w') as f1:
+    log.debug('Device' + str(devicenumber) + ' ' + answer)
diff --git a/packages/modules/smarthome/nibe/watt.py b/packages/modules/smarthome/nibe/watt.py
index 3b9bc3f286..d723965d22 100644
--- a/packages/modules/smarthome/nibe/watt.py
+++ b/packages/modules/smarthome/nibe/watt.py
@@ -29,8 +29,7 @@
     CurrentPower = None  # Handle error case
 
 answer = '{"power":' + str(CurrentPower) + '}'
-f1 = open('/var/www/html/openWB/ramdisk/smarthome_device_ret' + str(devicenumber), 'w')
-json.dump(answer, f1)
-f1.close()
+with open('/var/www/html/openWB/ramdisk/smarthome_device_ret' + str(devicenumber), 'w') as f1:
+    json.dump(answer, f1)
 
 client.close()  # clean disconnect from modbus server
diff --git a/packages/modules/smarthome/smaem/watt.py b/packages/modules/smarthome/smaem/watt.py
index bfb767a89a..f31ef9c3d2 100644
--- a/packages/modules/smarthome/smaem/watt.py
+++ b/packages/modules/smarthome/smaem/watt.py
@@ -33,7 +33,6 @@
 import os
 import datetime
 import time
-import json
 import signal
 import socket
 import struct
@@ -68,7 +67,7 @@ def abortprogram(signal, frame):
 timefile = '/var/www/html/openWB/ramdisk/smarthome_device_ret' + \
     str(devicenumber) + '_time'  # Dummy file needed for timestamp of last metering
 # Logfile for additional output beside of the smarthome.log
-debugfile = open('/var/www/html/openWB/ramdisk/smaem.log', 'a', newline='\r\n')
+
 
 sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
 sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
@@ -108,9 +107,9 @@ def abortprogram(signal, frame):
              "HomeManager (2) is sending in the network.")
 
 emparts = decode_speedwire(sock_data)
-debugfile.write(str(datetime.datetime.now()) + ': smaserial: #' + str(smaserial) + '# - Current SMA serial number:#' +
-                str(emparts['serial']) + '# - watt:#' + str(int(emparts.get("pconsume"))) + '# - wattc:#' +
-                str("{:.3f}".format(int(emparts.get('pconsumecounter')*1000))) + '#\n')
+log.debug('SMA:: smaserial: #' + str(smaserial) + '# - Current SMA serial number:#' +
+          str(emparts['serial']) + '# - watt:#' + str(int(emparts.get("pconsume"))) + '# - wattc:#' +
+          str("{:.3f}".format(int(emparts.get('pconsumecounter')*1000))) + '#')
 
 # Remember: We assume that beside of our EnergyMeter there are more SMA devices present (like HomeManager 2.0 or other
 # EnergyMeter) - so must not accept any data or smaserial = None
@@ -118,8 +117,8 @@ def abortprogram(signal, frame):
     # our output variables
     watt = str(int(emparts.get("pconsume")))
     wattc = str("{:.3f}".format(int(emparts.get('pconsumecounter')*1000)))
-    debugfile.write(str(datetime.datetime.now()) + ': 1 - Our SMA EM ' + str(smaserial) +
-                    ' is sending, everything fine. watt: #' + str(watt) + '# - wattc: #' + str(wattc) + '#\n')
+    log.debug('SMA:: 1 - Our SMA EM ' + str(smaserial) +
+              ' is sending, everything fine. watt: #' + str(watt) + '# - wattc: #' + str(wattc) + '#')
 # Scenario 2: Our EnergyMeter is not sending but we have a returnfile which is older than n seconds (parameter
 # secondssincelastmetering)
 elif ((os.path.isfile(returnfile)) and
@@ -128,29 +127,27 @@ def abortprogram(signal, frame):
     # We set "0" as current Power Consume (pconsume) and (from the existing ret-file) the last value for the Power
     # Consume Counter (pconsumecounter)
     watt = '0'
-    ret = open(returnfile, 'r')
-    lastvalues = ret.read()
-    ret.close()
+    with open(returnfile, 'r') as ret:
+        lastvalues = ret.read()
     timesincelastmetering = int(round(time.time(), 0)-lastmodificationtime)
     wattc = lastvalues[int(lastvalues.rfind('powerc')) + 9:lastvalues.find('}')]
-    debugfile.write(str(datetime.datetime.now()) + ': 2 - Debug: time.time(): #' + str(round(time.time(), 0)) +
-                    '# - lastmodificationtime: #' + str(lastmodificationtime) +
-                    '# - timesincelastmetering: #' + str(timesincelastmetering) +
-                    '# - int(secondssincelastmetering): #' + str(int(secondssincelastmetering)) + '#\n')
-    debugfile.write(str(datetime.datetime.now()) + ': 2 - We create a fake ret-file. watt: #' + str(watt) +
-                    '# - wattc: #' + str(
+    log.debug('SMA:: 2 - Debug: time.time(): #' + str(round(time.time(), 0)) +
+              '# - lastmodificationtime: #' + str(lastmodificationtime) +
+              '# - timesincelastmetering: #' + str(timesincelastmetering) +
+              '# - int(secondssincelastmetering): #' + str(int(secondssincelastmetering)) + '#')
+    log.debug('SMA:: 2 - We create a fake ret-file. watt: #' + str(watt) +
+              '# - wattc: #' + str(
         wattc) + '# - lastvalues: #' + lastvalues + '# - int-lastvalues.rfind-powerc: #' +
-        str((lastvalues.rfind('powerc'))) + '#\n')
+        str((lastvalues.rfind('powerc'))) + '#')
 
 # Scenario 3: Our EnergyMeter is not sending but we have a returnfile which is younger than n seconds
 # (parameter secondssincelastmetering)
 elif ((os.path.isfile(returnfile)) and
         (int((round(time.time(), 0)-lastmodificationtime)) < int(secondssincelastmetering))):
     # We have a ret-file which is younger than n seconds. We do nothing as the existing ret-file is good enough.
-    debugfile.write(str(datetime.datetime.now()) +
-                    ': 3 - The existing ret-file is fine enough. round(time.time(),0): #' + str(round(time.time(), 0))
-                    + '# - lastmodificationtime: #' + str(lastmodificationtime) + '# - secondssincelastmetering: #'
-                    + str(secondssincelastmetering) + '#\n')
+    log.debug('SMA:: 3 - The existing ret-file is fine enough. round(time.time(),0): #' + str(round(time.time(), 0))
+              + '# - lastmodificationtime: #' + str(lastmodificationtime) + '# - secondssincelastmetering: #'
+              + str(secondssincelastmetering) + '#')
     sys.exit("Module SMAEM: No data received but we have historical data which is younger than " +
              str(secondssincelastmetering) + " seconds.")
 else:
@@ -162,20 +159,16 @@ def abortprogram(signal, frame):
     # Module SMAEM: No data received and no historical data since boot time
     # Leistungsmessung smaem [...] Fehlermeldung: [Errno 2] No such file or directory:
     # '/var/www/html/openWB/ramdisk/smarthome_device_ret1'
-    debugfile.write(str(datetime.datetime.now()) + ': 4 - No data received and no historical data since boottime\n')
+    log.debug('SMA:: 4 - No data received and no historical data since boottime')
     sys.exit(str(datetime.datetime.now()) + ": Module SMAEM: No data received and no historical data since boottime")
 
 # General output section
 
 answer = '{"power":' + watt + ',"powerc":' + wattc + '}'
-f = open(returnfile, 'w')
-json.dump(answer, f)
-f.close()
 
-t = open(timefile, 'w')
-t.write(str(datetime.datetime.now()) +
-        ': File is created by Smarthome module SMAEM for validating the timestamp of the last return-file creation.')
-t.close()
+with open(timefile, 'w') as t:
+    t.write(str(datetime.datetime.now()) +
+            ': File is created by Smarthome module SMAEM for validating '
+            'the timestamp of the last return-file creation.')
 
-debugfile.write(str(datetime.datetime.now()) + ': 99 - Output answer: #' + answer + '#\n')
-debugfile.close()
+log.debug('SMA:: 99 - Output answer: #' + answer + '#')
diff --git a/packages/modules/smarthome/tasmota/watt.py b/packages/modules/smarthome/tasmota/watt.py
index b5f9a54832..533d796d39 100644
--- a/packages/modules/smarthome/tasmota/watt.py
+++ b/packages/modules/smarthome/tasmota/watt.py
@@ -26,6 +26,5 @@
     relais = 1
 powerc = 0
 answer = '{"power":' + str(aktpower) + ',"powerc":' + str(powerc) + ',"on":' + str(relais) + '} '
-f1 = open('/var/www/html/openWB/ramdisk/smarthome_device_ret' + str(devicenumber), 'w')
-json.dump(answer, f1)
-f1.close()
+with open('/var/www/html/openWB/ramdisk/smarthome_device_ret' + str(devicenumber), 'w') as f1:
+    json.dump(answer, f1)
diff --git a/packages/modules/smarthome/viessmann/off.py b/packages/modules/smarthome/viessmann/off.py
index 12cf698ef9..d294441d9e 100644
--- a/packages/modules/smarthome/viessmann/off.py
+++ b/packages/modules/smarthome/viessmann/off.py
@@ -1,14 +1,10 @@
 #!/usr/bin/python3
 import sys
-import os
-import time
 from pymodbus.client.sync import ModbusTcpClient
 import logging
 
 log = logging.getLogger(__name__)
 
-named_tuple = time.localtime()  # getstruct_time
-time_string = time.strftime("%m/%d/%Y, %H:%M:%S viessmann off.py", named_tuple)
 devicenumber = str(sys.argv[1])
 ipadr = str(sys.argv[2])
 uberschuss = int(sys.argv[3])
@@ -22,22 +18,14 @@
 # coils read write boolean
 # register start 00000
 #
-file_string = '/var/www/html/openWB/ramdisk/smarthome_device_' + str(devicenumber) + '_viessmann.log'
-file_stringpv = '/var/www/html/openWB/ramdisk/smarthome_device_' + str(devicenumber) + '_pv'
-if os.path.isfile(file_string):
-    f = open(file_string, 'a')
-else:
-    f = open(file_string, 'w')
-log.debug('%s devicenr %s ipadr %s ueberschuss %6d try to connect (modbus)' %
-          (time_string, devicenumber, ipadr, uberschuss), file=f)
+log.debug(f"[Viessmann {devicenumber}] devicenr {devicenumber} ipadr {ipadr} "
+          f"ueberschuss {uberschuss:6d} try to connect (modbus)")
 client = ModbusTcpClient(ipadr, port=502)
 rq = client.write_coil(16, False, unit=1)
-log.debug(rq, file=f)
+log.debug(f"[Viessmann {devicenumber}] Modbus write_coil response: {rq}")
 client.close()
-log.debug('%s devicenr %s ipadr %s Einmalige Warmwasseraufbereitung deaktiviert CO-17 = 0 ' %
-          (time_string, devicenumber, ipadr), file=f)
-f.close()
+log.debug(
+    f"[Viessmann {devicenumber}] devicenr {devicenumber} ipadr {ipadr} "
+    "Einmalige Warmwasseraufbereitung deaktiviert CO-17 = 0")
 pvmodus = 0
-f = open(file_stringpv, 'w')
-f.write(str(pvmodus))
-f.close()
+log.debug(f"[Viessmann {devicenumber}] PV-Modus gesetzt: {pvmodus}")
diff --git a/packages/modules/smarthome/viessmann/on.py b/packages/modules/smarthome/viessmann/on.py
index f85a7d6d6f..5f7415cd16 100644
--- a/packages/modules/smarthome/viessmann/on.py
+++ b/packages/modules/smarthome/viessmann/on.py
@@ -1,14 +1,10 @@
 #!/usr/bin/python3
 import sys
-import os
-import time
 from pymodbus.client.sync import ModbusTcpClient
 import logging
 
 log = logging.getLogger(__name__)
 
-named_tuple = time.localtime()  # getstruct_time
-time_string = time.strftime("%m/%d/%Y, %H:%M:%S viessmann on.py", named_tuple)
 devicenumber = str(sys.argv[1])
 ipadr = str(sys.argv[2])
 uberschuss = int(sys.argv[3])
@@ -24,21 +20,14 @@
 # coils read write boolean
 # register start 00000
 #
-file_string = '/var/www/html/openWB/ramdisk/smarthome_device_' + str(devicenumber) + '_viessmann.log'
-file_stringpv = '/var/www/html/openWB/ramdisk/smarthome_device_' + str(devicenumber) + '_pv'
-if os.path.isfile(file_string):
-    f = open(file_string, 'a')
-else:
-    f = open(file_string, 'w')
-log.debug('%s devicenr %s ipadr %s ueberschuss %6d try to connect (modbus)' %
-          (time_string, devicenumber, ipadr, uberschuss), file=f)
+log.debug(
+    f"[Viessmann {devicenumber}] devicenr {devicenumber} ipadr {ipadr} "
+    f"ueberschuss {uberschuss:6d} try to connect (modbus)")
 client = ModbusTcpClient(ipadr, port=502)
 rq = client.write_coil(16, True, unit=1)
-log.debug(rq, file=f)
+log.debug(f"[Viessmann {devicenumber}] Modbus write_coil response: {rq}")
 client.close()
-log.debug('%s devicenr %s ipadr %s Einmalige Warmwasseraufbereitung aktiviert CO-17 = 1' %
-          (time_string, devicenumber, ipadr), file=f)
-f.close()
-f = open(file_stringpv, 'w')
-f.write(str(1))
-f.close()
+log.debug(
+    f"[Viessmann {devicenumber}] devicenr {devicenumber} ipadr {ipadr} "
+    "Einmalige Warmwasseraufbereitung aktiviert CO-17 = 1")
+log.debug(f"[Viessmann {devicenumber}] PV-Modus gesetzt: 1")
diff --git a/packages/modules/smarthome/viessmann/watt.py b/packages/modules/smarthome/viessmann/watt.py
index e46ec14986..5d192050aa 100644
--- a/packages/modules/smarthome/viessmann/watt.py
+++ b/packages/modules/smarthome/viessmann/watt.py
@@ -1,24 +1,24 @@
 #!/usr/bin/python3
+
 import sys
 import os
-import time
 import json
+import logging
+
+log = logging.getLogger(__name__)
 
-named_tuple = time.localtime()  # getstruct_time
-time_string = time.strftime("%m/%d/%Y, %H:%M:%S viessmann watty.py", named_tuple)
 devicenumber = str(sys.argv[1])
 ipadr = str(sys.argv[2])
 uberschuss = int(sys.argv[3])
-file_stringpv = '/var/www/html/openWB/ramdisk/smarthome_device_' + str(devicenumber) + '_pv'
+file_stringpv = f'/var/www/html/openWB/ramdisk/smarthome_device_{devicenumber}_pv'
 # PV-Modus
 pvmodus = 0
 if os.path.isfile(file_stringpv):
-    f = open(file_stringpv, 'r')
-    pvmodus = int(f.read())
-    f.close()
+    with open(file_stringpv, 'r') as f:
+        pvmodus = int(f.read())
 aktpower = 0
 powerc = 0
-answer = '{"power":' + str(aktpower) + ',"powerc":' + str(powerc) + ',"on":' + str(pvmodus) + '} '
-f1 = open('/var/www/html/openWB/ramdisk/smarthome_device_ret' + str(devicenumber), 'w')
-json.dump(answer, f1)
-f1.close()
+answer = {"power": aktpower, "powerc": powerc, "on": pvmodus}
+outfile = f'/var/www/html/openWB/ramdisk/smarthome_device_ret{devicenumber}'
+with open(outfile, 'w') as f1:
+    json.dump(answer, f1)
diff --git a/packages/modules/smarthome/we514/watt.py b/packages/modules/smarthome/we514/watt.py
index 5a12363c25..f9d3afe00e 100644
--- a/packages/modules/smarthome/we514/watt.py
+++ b/packages/modules/smarthome/we514/watt.py
@@ -33,9 +33,8 @@
 resp = client.read_holding_registers(CurrentPowerRegisterAddress, 1, unit=MODBUS_DEVICEID)
 CurrentPower = int(resp.registers[0])
 
-answer = '{"power":' + str(CurrentPower) + ',"powerc":' + str(TotalEnergy) + '} '
-f1 = open('/var/www/html/openWB/ramdisk/smarthome_device_ret' + str(devicenumber), 'w')
-json.dump(answer, f1)
-f1.close()
+answer = {"power": CurrentPower, "powerc": TotalEnergy}
+with open(f'/var/www/html/openWB/ramdisk/smarthome_device_ret{devicenumber}', 'w') as f1:
+    json.dump(answer, f1)
 
 client.close()  # clean disconnect from modbus server