add udev instructions

source/interface/gpio/index.rst

@@ -15,6 +15,27 @@ See below for a list of supported boards that this module can be used with.
  **You will also need to install requirements for the board you are using.**
 
 
+Permissions
+===========
+
+A ``udev`` rule file is provided to simplify access permissions for GPIO pins.
+
+First add the ``gpio`` group if it does not exist:
+
+.. code-block:: shell
+
+ sudo addgroup --system gpio
+
+Then install the ``udev`` rule, add the user running MQTTany to the ``gpio``
+group, and reboot:
+
+.. code-block:: shell
+
+ sudo cp udev/98-gpio.rules /etc/udev/rules.d/
+ sudo usermod -aG gpio mqttany
+ sudo reboot now
+
+
 Supported Boards
 ================
 

source/interface/i2c/index.rst

@@ -20,6 +20,27 @@ driver.
  system you are using.
 
 
+Permissions
+===========
+
+A ``udev`` rule file is provided to simplify access permissions for I2C buses.
+
+First add the ``i2c`` group if it does not exist:
+
+.. code-block:: shell
+
+ sudo addgroup --system i2c
+
+Then install the ``udev`` rule, add the user running MQTTany to the ``i2c``
+group, and reboot:
+
+.. code-block:: shell
+
+ sudo cp udev/98-i2c.rules /etc/udev/rules.d/
+ sudo usermod -aG i2c mqttany
+ sudo reboot now
+
+
 Devices
 =======
 

source/interface/onewire/index.rst

@@ -18,6 +18,27 @@ The OneWire module provides access to Dallas/Maxim OneWire devices using the
  This process will vary based on the board and operatering system you are using.
 
 
+Permissions
+===========
+
+A ``udev`` rule file is provided to simplify access permissions for ``wire-1`` devices.
+
+First add the ``wire`` group if it does not exist:
+
+.. code-block:: shell
+
+ sudo addgroup --system wire
+
+Then install the ``udev`` rule, add the user running MQTTany to the ``wire``
+group, and reboot:
+
+.. code-block:: shell
+
+ sudo cp udev/98-w1.rules /etc/udev/rules.d/
+ sudo usermod -aG wire mqttany
+ sudo reboot now
+
+
 Devices
 =======