diff --git a/.github/workflows/run_pytest.yml b/.github/workflows/run_pytest.yml
index 30b9fe5..5e374e9 100644
--- a/.github/workflows/run_pytest.yml
+++ b/.github/workflows/run_pytest.yml
@@ -8,7 +8,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python-version: [3.5, 3.6, 3.7, 3.8]
+        python-version: [3.5, 3.6, 3.7, 3.8, 3.9]
     runs-on: ${{matrix.os}}
 
     steps:
diff --git a/boswatch/inputSource/sdrInput.py b/boswatch/inputSource/sdrInput.py
index dcac725..6b1faf7 100644
--- a/boswatch/inputSource/sdrInput.py
+++ b/boswatch/inputSource/sdrInput.py
@@ -15,6 +15,7 @@
 @description: Input source for sdr with rtl_fm
 """
 import logging
+import time
 from boswatch.utils import paths
 from boswatch.processManager import ProcessManager
 from boswatch.inputSource.inputBase import InputBase
@@ -47,8 +48,14 @@ class SdrInput(InputBase):
             logging.info("start decoding")
             while self._isRunning:
                 if not sdrProc.isRunning:
-                    logging.warning("rtl_fm was down - try to restart")
+                    logging.warning("rtl_fm was down - trying to restart in 10 seconds")
+                    time.sleep(10)
+
                     sdrProc.start()
+                    if sdrProc.isRunning:
+                        logging.info("rtl_fm is back up - restarting multimon...")
+                        mmProc.setStdin(sdrProc.stdout)
+                        mmProc.start()
                 elif not mmProc.isRunning:
                     logging.warning("multimon was down - try to restart")
                     mmProc.start()
diff --git a/requirements.txt b/requirements.txt
index b401509..580f9da 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,6 +9,6 @@ mkdocs
 # for develope only
 pytest
 pytest-cov
-pytest-pep8
+pytest-flake8
 pytest-flakes
 pytest-randomly
diff --git a/test/pytest.ini b/test/pytest.ini
index e5d4311..b2fdf96 100644
--- a/test/pytest.ini
+++ b/test/pytest.ini
@@ -8,7 +8,7 @@
 #                     by Bastian Schroll
 
 [pytest]
-addopts = -v --pep8 --flakes --cov=boswatch/ --cov=module/ --cov plugin/ --cov-report=term-missing --log-level=CRITICAL
+addopts = -v --flake8 --flakes --cov=boswatch/ --cov=module/ --cov plugin/ --cov-report=term-missing --log-level=CRITICAL
 
 # classic or progress
 console_output_style = progress 
@@ -18,8 +18,11 @@ log_file_level=debug
 log_file_format=%(asctime)s - %(module)-12s %(funcName)-15s [%(levelname)-8s] %(message)s
 log_file_date_format=%d.%m.%Y %H:%M:%S
 
-#pep8 plugin
-pep8ignore = E402 E501
+#flake8 plugin
+flake8-ignore = E402 E501 E722 W504 W605
 # E402 # import not at top
 # E501 # line too long
-# pep8maxlinelength = 99
\ No newline at end of file
+# E722 # do not use bare 'except'
+# W504 # line break after binary operator
+# W605 # invalid escape sequence
+# flake8-max-line-length = 99
\ No newline at end of file