Rubi codenoid

NSSM cheatsheat

See: NSSM - the Non-Sucking Service Manager

Create a new service
List parameters for a service
Set a parameter for a service
Parameter list

Create a new service

SIM Card Management Over GSM Modem

A small guide on how to send and receive USSD codes on Linux

I am using the built in GSM (UMTS) modem of my Thinkpad X1 extensively because I am often in places with flaky internet connections. I connect through the standard Network Manager on Ubuntu and everything works fine. There was one major annoyance though. Every time I wanted to top up the SIM balance or book a new package, I needed a phone to send and receive USSD codes. So I took some time to figure out how to do it from the shell. I wrote this down as a help for others and a reminder for myself. Without further ado...

First intsall gammu and picocom.

➜  ~  sudo apt-get install -y gammu picocom

Using OTP's observer (appmon replacement) remotely

$ ssh remote-host "epmd -names"
epmd: up and running on port 4369 with data:
name some_node at port 58769

Note the running on port for epmd itself and the port of the node you're interested in debugging. Reconnect to the remote host with these ports forwarded:

$ ssh -L 4369:localhost:4369 -L 58769:localhost:58769 remote-host

In mongodb it's easy to make at upsert, meaning update-or-insert by calling

db.collection.update({criteria}, {updated fields}, true)

The third parameter means - insert a new document if the document doesn't exist yet. So, for example, the following will insert a new document for the user if there's no document for that user yet, and will update it if it already exists:

 db.users.update({user_id: '1234'}, {user_id: '1234', name: 'Ran'}, true)

	#!/usr/bin/env python

	from __future__ import print_function
	import base64
	import hashlib
	import hmac
	import struct
	import sys
	import time

	// This is an example program that iterates over all
	// items in a mongodb collection in a memory safe way
	package main

	import (
	"labix.org/v2/mgo"
	"labix.org/v2/mgo/bson"
	"fmt"
	)

	package test

	import (
	"fmt"
	"labix.org/v2/mgo"
	"labix.org/v2/mgo/bson"
	"testing"
	)

	const INSERT_COUNT int = 10000

	# LICENSE: public domain

	def calculate_initial_compass_bearing(pointA, pointB):
	"""
	Calculates the bearing between two points.

	The formulae used is the following:
	θ = atan2(sin(Δlong).cos(lat2),
	cos(lat1).sin(lat2) − sin(lat1).cos(lat2).cos(Δlong))