{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [],
   "source": [
    "import zmq             #import modules\n",
    "import hashlib\n",
    "import datetime\n",
    "import numpy as np\n",
    "import time\n",
    "from   IPython.display import clear_output"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "#setup ZMQ publisher\n",
    "\n",
    "context         = zmq.Context()\n",
    "outgoing_socket = context.socket(zmq.PUB)\n",
    "outgoing_socket.bind(\"tcp://127.0.0.1:12345\") \n",
    "#  PUBLISHERS : BIND    |||  SUBSCRIBERS : CONNECT"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [],
   "source": [
    "#sending data over ZMQ\n",
    "\n",
    "def send_data(dataset, socket):\n",
    "    sha256 = hashlib.sha256()\n",
    "    sha256.update(dataset.tobytes())\n",
    "    hash_value = sha256.hexdigest()\n",
    "    \n",
    "    socket.send_multipart([\n",
    "        dataset.tobytes(),\n",
    "        hash_value.encode('utf-8')\n",
    "    ])"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[2018-11-21 14:51:58.558681]\n"
     ]
    }
   ],
   "source": [
    "#main generate data and send loop\n",
    "\n",
    "transmission_interval = 5 # seconds\n",
    "while True:\n",
    "    mean_of_distribution = 5    # center\n",
    "    std_of_distribution  = 100  # spread (width)\n",
    "    number_of_samples    = 1000\n",
    "    dataset              = np.random.normal(\n",
    "                             mean_of_distribution,\n",
    "                             std_of_distribution, \n",
    "                             number_of_samples\n",
    "                           )\n",
    "    send_data(dataset, outgoing_socket)\n",
    "    \n",
    "    clear_output()\n",
    "    print(\"[%s]\" % datetime.datetime.now())\n",
    "    time.sleep(transmission_interval)"
   ]
  }
 ],
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