update usps doc (#4729)

* Update usps.markdown

* Update usps.markdown

note Chrome preference
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happyleavesaoc 2018-02-22 11:45:45 -05:00 committed by Alok Saboo
parent b5dbc788a9
commit e15388f93a

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@ -16,6 +16,35 @@ ha_iot_class: "Cloud Polling"
The `usps` platform allows one to track deliveries and inbound mail from the [US Postal Service (USPS)](https://www.usps.com/).
In addition to having a USPS account, you will need to complete the "Opt-In" process for packages by clicking "Get Started Now" on [this page](https://my.usps.com/mobileWeb/pages/intro/start.action). You must also "Opt-In" to [Informed Delivery](https://informeddelivery.usps.com/box/pages/intro/start.action) to see inbound mail.
## Prerequisites
This component requires that a headless-capable web browser is installed on your system - either PhantomJS or Google Chrome. Preferably use Chrome if your operating system supports it, since PhantomJS is deprecated.
<p class='note warning'>
If you are using a Raspberry Pi, you must use PhantomJS.
</p>
### PhantomJS
Install the latest version of [PhantomJS]( http://phantomjs.org/download.html). Ensure the executable is on your `PATH`. `phantomjs --version` should work and report the correct version. This is the default option and requires no further configuration.
<p class='note warning'>
Don't use apt-get to install PhantomJS. This version is not compatible.
</p>
### Chrome
Install Chrome 59 or greater (preferably the most recent). Install the latest [Chromedriver](https://sites.google.com/a/chromium.org/chromedriver/downloads). Ensure both executables are on your `PATH`. `google-chrome --version` and `chromedriver --version` should work and report the correct version.
OS-specific instructions:
- [Ubuntu 16](https://gist.github.com/ziadoz/3e8ab7e944d02fe872c3454d17af31a5) (Selenium server portion *not* necessary)
- [RHEL/Centos 7](https://stackoverflow.com/a/46686621)
If you use the Chrome option, specify `driver: chrome` in your `usps` configuration.
## Configuration
To enable this component, add the following lines to your `configuration.yaml`:
```yaml