diff --git a/readme.md b/readme.md
new file mode 100644
index 0000000..95bf7f4
--- /dev/null
+++ b/readme.md
@@ -0,0 +1,26 @@
+## Disable the serial console, disable bluetooth and disable the hciuart service:
+
+https://www.raspberrypi.org/documentation/configuration/uart.md
+https://www.raspberrypi.org/forums/viewtopic.php?t=178071
+
+
+### Disable hciuart and other bluetooth related services:
+* `systemctl disable hciuart`
+* `systemctl disable bluealsa`
+* `systemctl disable bluetooth`
+
+### Disable serial console:
+* Check `/boot/cmdline.txt`
+* Comment line `console=serial0,115200` or `console=ttyAMA0,115200` or similar
+
+### Disable bluetooth
+* Add `dtoverlay=pi3-disable-bt` to `/boot/config.txt`
+
+
+
+## Serial port configuration in Python:
+
+https://pythonhosted.org/pyserial/shortintro.html#opening-serial-ports
+
+Consider a timeout!
+
diff --git a/snippets/snippet1.py b/snippets/snippet1.py
index 59255bf..a37bf3a 100644
--- a/snippets/snippet1.py
+++ b/snippets/snippet1.py
@@ -114,6 +114,8 @@ class MeterbusSerial(object):
 
     self.port.write(msg)
 
+    # FIXME: Attention, the actual write time of the interface is not considered.
+    #        This is a measured value.
     sleep(0.030)
 
     frontendHold()
@@ -130,6 +132,7 @@ class MeterbusSerial(object):
     expectedUserDataOctets = 0
     state = MeterbusResponseStates.START1
     while (state not in [MeterbusResponseStates.DONE, MeterbusResponseStates.ERROR]):
+      print("Waiting for input ... ")
       c = self.port.read()
 
       print("State {}, Octet {}".format(state, c))