Notes

Stuff I just might find helpful later #tech #make

[amythical]

Openwrt XML::Parser not found error

apt-get update

Install expat-devel

if apt-get install expat-devel gives an error

search for the right file using apt-cache search expat

apt-get install libexpat-devel1

cpan

install XML::Parser

[amythical]

mp4 to mov on mac/linux

ffmpeg -i input_file.mp4 -acodec copy -vcodec copy -f mov output_file.mov

[amythical]

Configure zohomail (hosted email) for your domain

1.Create Zoho mail account

https://www.zoho.com/mail/

2.HTML verify domain as per instructions (download an html file, put it in specified directory on your site and let Zoho verify it)

3.Add MX record entries in DNS

Remove any other MX record entries

https://www.zoho.com/mail/help/adminconsole/godaddy.html#mx

Verify with https://mxtoolbox.com/

4. Add SPF entries in DNS 

https://www.zoho.com/campaigns/help/setup-spf-dkim.html#GoDaddy

5. Add DKIM entries in DNS

https://www.zoho.com/mail/help/adminconsole/dkim-configuration.html#alink1

Should take 30-60 mins for propagation

[amythical]

Flite on raspi - Text to speech

Default Installation

https://learn.adafruit.com/speech-synthesis-on-the-raspberry-pi/speak-easier-flite

Install dependency to remake

sudo apt-get install libasound2-dev

Remake for external sounds

https://raspberrypi.stackexchange.com/questions/10384/speech-processing-on-the-raspberry-pi

[amythical]

Accept facebooks lead gen tos

To run facebook lead ads on a facebook page, it asks to accept lean gen tos.

Here is the link to it https://www.facebook.com/ads/leadgen/tos

[amythical]

MediatekSDK - Issues & Solutions

1.Error during make about ftp.kernel.org

   Check the file to be downloaded by ftp using make -j1 V=s

   Download that file using wget in the dl folder, example below

   wget http://kernel.org/pub/linux/utils/util-linux/v2.25/util-linux-2.25.2.tar.xz

2.Mosquitto needs libuuid

Install it using scripts/feeds/install libuuid

make again

On the device install libuuid first and then mosquitto

3.For interrupts use libmraa

In the package Makefile, in the define package/ sections add  

 DEPENDS:=+libmraa

In the Makefile for the source add

LDFLAGS=-lmraa

[amythical]

Cordova Ionic npm node android - Install & Upgrade

For Mac OS

Uninstall npm

sudo npm uninstall npm -g

rm -rf /usr/local/{lib/node{,/.npm,_modules},bin,share/man}/npm* ls -laF /usr/local/{lib/node{,/.npm},bin,share/man} | grep npm

find /usr/local/{lib/node,bin} -exec grep -l npm \{\} \; ;

Install npm

brew update

brew install npm

Install node

brew install node

Install cordova

npm install -g cordova@latest

Install specific ionic version

npm info ionic

npm install -g [email protected]

Update Android SDK

android

No need to download emulator images (System Images)

Update cordova-android

cordova platform ls

cordova platform update android

Cordova version 6.0.0 supports android-24 which is Android version 6.0

[amythical]

Error: Please install Android target: "android-23".

ionic build android if it throws up Error: Please install Android target: "android-23".

Fixes -

1.Figure what version of the android Platform you have installed by running ‘android’ provided your PATH and ANDROID_HOME is set.Update to the latest available Platform SDK.

Check if you can see API 23 

If Yes then select it and update.

If No then rm -rf /Users/username/.gradle/

Run android again and you should see the latest versions available to update.

[amythical]

Ssh automate with public keys

1.Gen key on local box 

ssh-keygen -t rsa -C "[email protected]"

2.On the server create a user 

adduser newuser

cd ~ mkdir .ssh chmod 700 .ssh touch .ssh/authorized_keys chmod 600 .ssh/authorized_keys vim .ssh/authorized_keys

Add contents of id_rsa.pub in this file and save it

3.Run ssh-agent on local box eval `ssh-agent -s` ssh-add ~/.ssh/id_rsa

4.On localbox execute

ssh user@servername

[amythical]

Unlocking modems

http://www.it-slav.net/blogs/2010/05/02/unlock-huawei-modems/

[amythical]

Install Discourse in a subfolder

Assuming discourse is installed and running on port 8080

We will have to make changes to discourse containers/app.yml as per 

http://learndiscourse.org/subfolder-support-with-docker/

in /var/discourse run sudo ./launcher rebuild app 

Make changes in nginx for proxy fwding

vim /etc/nginx/nginx.conf

location /forum/{        rewrite ^/forum(.*) /$1 break;        proxy_pass http://domain:8080;        }

sudo service nginx stop

sudo service nginx start

Access your site at http://domain

Access discourse at http://domain/forum/

[amythical]

Discourse, nginx and wordpress on AWS Linux - no docker

2Install discourse from here

https://github.com/discourse/discourse/blob/master/docs/INSTALL-cloud.md

Change port in app.yml to 8080

Open port 8080 in AWS Console

Install nginx,mysql and php from http://codingsteps.com/install-php-fpm-nginx-mysql-on-ec2-with-amazon-linux-ami/

edit /etc/nginx/nginx.conf 

Change servername to your domain

In the server{} block add 

       rewrite ^/forum/(.*)$ http://domain:8080/$1 redirect;

Assumption is the yourdomain/forum will redirect to yourdomain:8080 which has discourse

http://domain should take you to nginx root

Install wordpress from here http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/hosting-wordpress.html

[amythical]

Docker remove ALL images

docker rmi -f $(docker images -aq)

PS - removes used and unused images - EXTREME MEASURE

[amythical]

Clean unused docker volumes

For Docker 1.9 and up there's a native way:

List all orphaned volumes with

$ docker volume ls -qf dangling=true

Eliminate all of them with

$ docker volume rm $(docker volume ls -qf dangling=true)

[amythical]

Docker nginx+ wordpress + discourse

Install docker and discourse from here 

https://serversforhackers.com/video/installing-discourse-with-docker

PS - While copying the yml file to the container keep web_only.yml as web.yml

Install nginx + wordpress 

https://github.com/eugeneware/docker-wordpress-nginx

Run the container in interactive mode as we have to do changes to nginx

Change 3000 with any port you wish (I did not have 80 available on external interface so changed it to 3000)

sudo docker run -p 3000:80 --name docker-wordpress-nginx -it -d eugeneware/docker-wordpress-nginx /bin/bash

sudo docker start instance123456

sudo docker attach instance123456

vim /etc/nginx/sites-enabled/default

Change server_name to your domain

Add the following for rewriting all urls starting with /forum/ to discourse running on external port 8080.Add inside server block in /etc/nginx/sites-enabled/default

rewrite ^/forum/(.*)$ http://yourdomain:8080/$1 redirect;

Restart nginx with nginx &

sudo service php5-fpm restart

Try http://yourdomain:3000 you should see wordpress and http://yourdomain:3000/forum/ you should see discourse

To quit docker without shutting down container in interactive mode use use the escape sequence Ctrl-p + Ctrl-q on Mac

[amythical]

Apache startup enable disable

sudo update-rc.d apache2 disable sudo update-rc.d apache2 enable

[amythical]

Bypass captive portal for Android

So you have created your Access Point on your device.

But when you try and connect to that WIFI on your mobile, you get an ugly popup - asking you if its OK to connect to this WIFI even though there is no internet.

If you are making an app, this throws your smooth app workflow off-track, causes one more confusing step to the customer, needs that you add an FAQ or instruct the customer why this is happening and distracts the consumer from your intended process.

How does this happen?

This is called ‘Captive Portal’.When a WIFI connects, android tries reaching out to connectivitycheck.gstatic.com for Marshmallow and clients3.google.com for Kitkat.

Android then calls a page generate_204 on these domains i.e it makes a call to connectivitycheck.gstatic.com/generate_204  for Marshmallow and clients3.google.com/generate_204 for Kitkat.

It expects a 204 HTTP response code in return instead of the usual 200 HTTP response code.

How I fixed it -

Step 1 - Resolve the domains locally

On my device I was running dnsmasq.Look at addn-hosts in the dnsmasq config file.In this directory pointed to by addn-hosts create a file called custom.

custom (contents below)

192.168.1.1 connectivitycheck.gstatic.com

192.168.1.1 clients3.google.com

restart dnsmasq.

Now connectivitycheck.gstatic.com & clients3.google.com resolve to your device’s webserver when connected by a client connected to your AP.

Step 2 - Server a 204 response

I was using uhttpd so did not have the url_rewrite option.What I managed to do is specified a php page as a 404 redirect in uhttpd conf.

       option error_page /204.php           

In the 404 php script, I returned a 204 header.Dirty hack but it works !!!

<?php

// .... log whatever you need to log, then reply:

header("HTTP/1.0 204 No Content");

?>

Now when connected to my AP, when the android device requests for connectivitycheck.gstatic.com/generate_204 it goes to a 404, which returns a 204 header and android is happy, it thinks its connected to the internet and the Captive Portal goes away automatically.

For Step 2 - if you have apache, do a url rewrite/htaccess mapping and redirect generate_204 to a page returning a 204 HTTP header.

Happy bypassing the Captive Portal for Android.

Bypassing IOS maybe later when I get to it. 

References 

http://android.stackexchange.com/questions/123129/how-does-wifi-in-android-detect-if-the-device-has-to-sign-in-or-not

https://en.wikipedia.org/wiki/Captive_portal

https://foxdogstudios.com/making-phones-believe-the-wifi-has-internet