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def parse_tle_number(tle_number_string):
    split_string = tle_number_string.split('-')
    if len(split_string) == 3:
        new_number = '-' + str(split_string[1]) + 'e-' + str(int(split_string[2])+1)
    elif len(split_string) == 2:
        new_number = str(split_string[0]) + 'e-' + str(int(split_string[1])+1)
    elif len(split_string) == 1:
        new_number = '0.' + str(split_string[0])
    else:
        raise TypeError('Input is not in the TLE float format')

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Let's Encrypt on Ubuntu 14.04, nginx with webroot auth

This document details how I setup LE on my server. Firstly, install the client as described on http://letsencrypt.readthedocs.org/en/latest/using.html and make sure you can execute it. I put it in /root/letsencrypt.

As it is not possible to change the ports used for the standalone authenticator and I already have a nginx running on port 80/443, I opted to use the webroot method for each of my domains (note that LE does not issue wildcard certificates by design, so you probably want to get a cert for www.example.com and example.com).

Configuration

For this, I placed config files into etc/letsencrypt/configs, named after <domain>.conf. The files are simple:

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package app.posmachine.machine;

import java.io.IOException;
import java.io.OutputStream;
import java.util.Enumeration;

import javax.comm.CommPortIdentifier;
import javax.comm.SerialPort;

public class PosPrinter {

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git clone <repo-address>

git tag -l

git checkout <tag-name>

git branch -D master

git checkout -b master

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// Converts an ArrayBuffer directly to base64, without any intermediate 'convert to string then
// use window.btoa' step. According to my tests, this appears to be a faster approach:
// http://jsperf.com/encoding-xhr-image-data/5

function base64ArrayBuffer(arrayBuffer) {
  var base64    = ''
  var encodings = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'

  var bytes         = new Uint8Array(arrayBuffer)
  var byteLength    = bytes.byteLength

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/*
In the node.js intro tutorial (http://nodejs.org/), they show a basic tcp 
server, but for some reason omit a client connecting to it.  I added an 
example at the bottom.

Save the following server in example.js:
*/

var net = require('net');