Orange Pi Zero/Dash Button Access Point Setup

This is a very condensed tutorial on how to set up an OrangePi running Armbian as an access point to intercept Dash Button commands, allowing you to have wireless buttons on the cheap. This is a project that migrates the existing solution I had on my Raspberry Pi 3 to the OrangePi, which frees up my Raspberry Pi 3 for other tasks, since most of the commands are replicated, the commands are listed here in order to set up the OrangePi. This tutorial borrows very heavily from frillip's tutorial and the python script borrows from Familab's tutorial.

The OrangePi Zero is a ethernet-wifi SOC that is sold on aliexpress for $8.99, which is a slightly cheaper price than a Raspberry Pi Zero, and about half the price of a Raspberry Pi Zero W.

The advantage the Orange Pi Zero has is that it is widely available and has a physical and wireless interfaces, allowing it to serve as a wireless endpoint for IOT applications. However, it lacks the kind of environment and support that the Raspberry Pi has, which makes it a poor platform for initial implementation. This board also does not have HDMI output which makes it mostly suited for headless tasks where a monitor is not required.

Due to the efforts of the kind folks at Armbian, most of the commands used in the Raspberry Pi are compatible with this particular board, and hence made porting much easier.

This tutorial picks up from after you are able to successfully connect to the Orange Pi Zero over ssh.

Install required packages

sudo apt-get install dnsmasq hostapd dhcpd dhcpcd5

Tell dhcpcd to ignore wlan0

In sudo nano /etc/dhcpcd.conf, at bottom of file:

denyinterface wlan0  
Configure static IP

sudo nano /etc/network/interfaces

allow-hotplug wlan0  
iface wlan0 inet static  
#    wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf
Configure hostapd

sudo nano /etc/hostapd/hostapd.conf

# This is the name of the WiFi interface we configured above

# Use the nl80211 driver with the brcmfmac driver

# This is the name of the network

# Use the 2.4GHz band

# Use channel 6

# Enable 802.11n

# Enable WMM

# Enable 40MHz channels with 20ns guard interval

# Accept all MAC addresses

# Use WPA authentication

# Require clients to know the network name

# Use WPA2

# Use a pre-shared key

# The network passphrase

# Use AES, instead of TKIP
Configure hostapd

In sudo nano /etc/default/hostapd replace:



Dnsmasq config

Create a copy:
sudo mv /etc/dnsmasq.conf /etc/dnsmasq.conf.orig

Open file for editing:
sudo nano /etc/dnsmasq.conf

interface=wlan0      # Use interface wlan0  
listen-address= # Explicitly specify the address to listen on  
bind-interfaces      # Bind to the interface to make sure we aren't sending things elsewhere  
server=       # Forward DNS requests to Google DNS  
domain-needed        # Don't forward short names  
bogus-priv           # Never forward addresses in the non-routed address spaces.  
dhcp-range=,,12h # Assign IP addresses between and with a 12 hour lease time  
Set up IPv4 forwarding

In sudo nano /etc/sysctl.conf remove # from the line net.ipv4.ip_forward=1

sudo iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE  
sudo iptables -A FORWARD -i eth0 -o wlan0 -m state --state RELATED,ESTABLISHED -j ACCEPT  
sudo iptables -A FORWARD -i wlan0 -o eth0 -j ACCEPT  

Save our configuration:
sudo sh -c "iptables-save > /etc/iptables.ipv4.nat"

Init file

In sudo nano /etc/rc.local, above exit 0:

iptables-restore < /etc/iptables.ipv4.nat  
rfkill unblock all  
Install pip & setuptools

sudo apt install pip3 setuptools

sudo pip3 --upgrade pip setuptools

Install needed python libraries

sudo pip3 install scrapy paho-mqtt

Add python scripts

Remember to change the HEX HERE to the MAC address of the Dash button. This can be done by running sudo /usr/sbin/hostapd /etc/hostapd/hostapd.conf, connecting the button to the AP and pressing the button. At this point the MAC address should be displayed in the output. This is a simple script that publishes "1" to the channel "light".

import sys  
import logging  
import codecs  
import paho.mqtt.publish as publish  
import time  

from scapy.all import *

decode_hex = codecs.getdecoder("hex_codec")

def arp_display(pkt):  
    if pkt[ARP].op == 1:
                if pkt[ARP].pdst == "":
                        if pkt[ARP].hwsrc == "HEX HERE":


def test(pkt):  
        if ARP in pkt and pkt[ARP].op in (1,2):
                return pkt.sprintf("ARP.hwsrc% %ARP.psrc%")
def onCheck():  

sniff(prn=arp_display, filter="arp", store=0)  
Create a script to automate the process

Since we don't want to have to manually run commands each time we boot up the OrangePi, we create a set of startup scripts to run each time it is booted:

sudo nano /etc/init.d/startupscript


sudo rfkill unblock wlan  
sudo ifconfig wlan0 up  
sudo service dnsmasq restart  
sudo /usr/sbin/hostapd /etc/hostapd/hostapd.conf  

chmod 755 startupscript

ln -s /etc/init.d/startupscript /etc/rc3.d/S99startupscript

Create a cronjob to start our python script

sudo crontab -e

@reboot sudo /usr/bin/python3 /full/path/here/ > /dev/null 2>&1


sudo reboot now


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