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April 21, 2018 10:33
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{ | |
"cells": [ | |
{ | |
"cell_type": "markdown", | |
"metadata": {}, | |
"source": [ | |
"The Sigfox network allows 12 bytes per point. The PAC / id and time do not need to be included in the point payload since they are in the envelope.\n", | |
"\n", | |
"Format:\n", | |
" * (1) Status bits\n", | |
" * (.1) Reserved\n", | |
" * (.1) Tilt\n", | |
" * (.1) Digital In Long Press\n", | |
" * (.1) TB1=1/SA4=0 (changes following fields)\n", | |
" * (.1) Battery Low\n", | |
" * (.1) GPS Good\n", | |
" * (.1) Digital In / Ignition\n", | |
" * (.1) PTO\n", | |
" * (3.4) Latitude\n", | |
" * (3.4) Longitude\n", | |
" * (1) Speed\n", | |
" * (1) Course\n", | |
" * (1) Altitude\n", | |
" * (1) Temperature (by 0.5 degrees) -64 -> 63" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 2, | |
"metadata": {}, | |
"outputs": [], | |
"source": [ | |
"import struct\n", | |
"import binascii\n", | |
"\n", | |
"def packll(latitude, longitude):\n", | |
" assert -180 <= longitude <= 180\n", | |
" assert -90 <= latitude <= 90\n", | |
" latitude = int((latitude + 180) * 600000)\n", | |
" longitude = int((longitude + 180) * 600000)\n", | |
" b0 = (latitude >> 20) & 0xff\n", | |
" b1 = (latitude >> 12) & 0xff\n", | |
" b2 = (latitude >> 4) & 0xff\n", | |
" b3 = (latitude & 0x0f) << 4\n", | |
" b3 |= (longitude >> 24) & 0x0f\n", | |
" b4 = (longitude >> 16) & 0xff\n", | |
" b5 = (longitude >> 8) & 0xff\n", | |
" b6 = longitude & 0xff\n", | |
" return struct.pack('>BBBBBBB', b0, b1, b2, b3, b4, b5, b6)\n", | |
"\n", | |
"def clamp(val, mn, mx):\n", | |
" if val < mn:\n", | |
" return mn\n", | |
" if val > mx:\n", | |
" return mx\n", | |
" return val\n", | |
"\n", | |
"def encode(data):\n", | |
" speed = clamp(int(data['speed']), 0, 255)\n", | |
" course = clamp(int(data['course']), 0, 359) // 2\n", | |
" altitude = clamp(int(data['altitude']), 0, 1023) // 8\n", | |
" temperature = clamp(int(data['temperature'] * 2 + 0.5), -128, 127) + 128\n", | |
" status = 0\n", | |
" if data.get('battLow'): status |= 0x08\n", | |
" if data.get('gpsGood'): status |= 0x04\n", | |
" if data.get('ignition'): status |= 0x02\n", | |
" if data.get('pto'): status |= 0x01\n", | |
" ret = struct.pack('B', status)\n", | |
" ret += packll(data['latitude'], data['longitude'])\n", | |
" ret += struct.pack('BBBB', speed, course, altitude, temperature)\n", | |
" return binascii.hexlify(ret)\n" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 3, | |
"metadata": {}, | |
"outputs": [], | |
"source": [ | |
"def unpackll(ll):\n", | |
" b0, b1, b2, b3, b4, b5, b6 = map(int, ll)\n", | |
" latitude = (b0 << 20) | (b1 << 12) | (b2 << 4) | (b3 >> 4)\n", | |
" longitude = (b3 & 0x0f) << 24 | (b4 << 16) | (b5 << 8) | b6\n", | |
" latitude = (float(latitude) / 600000) - 180\n", | |
" longitude = (float(longitude) / 600000) - 180\n", | |
" return latitude, longitude\n", | |
"\n", | |
"def decode(payload):\n", | |
" data = {}\n", | |
" payload = binascii.unhexlify(payload)\n", | |
" data['latitude'], data['longitude'] = unpackll(payload[1:8])\n", | |
" data['speed'] = int(payload[8])\n", | |
" data['course'] = int(payload[9]) * 2\n", | |
" data['altitude'] = int(payload[10]) * 8\n", | |
" data['temperature'] = float(payload[11]) / 2 - 64\n", | |
" status = payload[0]\n", | |
" data['battLow'] = bool(status & 0x08)\n", | |
" data['gpsGood'] = bool(status & 0x04)\n", | |
" data['ignition'] = bool(status & 0x02) # Digital Input on TBSA\n", | |
" data['pto'] = bool(status & 0x01)\n", | |
" return data\n" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 4, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"name": "stdout", | |
"output_type": "stream", | |
"text": [ | |
"b'0151736bccaa18b8201e0b98'\n", | |
"{'latitude': -37.654300000000006, 'longitude': 174.1234, 'speed': 32, 'course': 60, 'altitude': 88, 'temperature': 12.0, 'battLow': False, 'gpsGood': False, 'ignition': False, 'pto': True}\n" | |
] | |
} | |
], | |
"source": [ | |
"data = {\n", | |
" 'latitude': -37.6543,\n", | |
" 'longitude': 174.1234,\n", | |
" 'speed': 32,\n", | |
" 'course': 60,\n", | |
" 'altitude': 88,\n", | |
" 'temperature': 12.2,\n", | |
" 'pto': True\n", | |
"}\n", | |
"payload = encode(data)\n", | |
"print(payload)\n", | |
"dec = decode(payload)\n", | |
"print(dec)" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 5, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"name": "stdout", | |
"output_type": "stream", | |
"text": [ | |
"{'latitude': -36.897115000000014, 'longitude': 174.77469000000002, 'speed': 12, 'course': 296, 'altitude': 224, 'temperature': 23.5, 'battLow': False, 'gpsGood': True, 'ignition': False, 'pto': False}\n" | |
] | |
} | |
], | |
"source": [ | |
"print(decode(b'0451e2563cb00f2e0c941caf'))" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 20, | |
"metadata": {}, | |
"outputs": [ | |
{ | |
"name": "stdout", | |
"output_type": "stream", | |
"text": [ | |
"{'latitude': -36.897099999999995, 'longitude': 174.77464500000002, 'speed': 1, 'course': 166, 'altitude': 248, 'temperature': 22.5, 'battLow': False, 'gpsGood': True, 'ignition': False, 'pto': False}\n" | |
] | |
} | |
], | |
"source": [ | |
"print(decode(b'0451e256ccb00f1301531fad'))" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": null, | |
"metadata": {}, | |
"outputs": [], | |
"source": [] | |
} | |
], | |
"metadata": { | |
"kernelspec": { | |
"display_name": "Python 3", | |
"language": "python", | |
"name": "python3" | |
}, | |
"language_info": { | |
"codemirror_mode": { | |
"name": "ipython", | |
"version": 3 | |
}, | |
"file_extension": ".py", | |
"mimetype": "text/x-python", | |
"name": "python", | |
"nbconvert_exporter": "python", | |
"pygments_lexer": "ipython3", | |
"version": "3.6.4" | |
} | |
}, | |
"nbformat": 4, | |
"nbformat_minor": 2 | |
} |
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