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DL-SDD.php
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DL-SDD.php
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<?php
/* https://www.decentlab.com/products/soil-moisture-temperature-and-salinity-profile */
abstract class DecentlabDecoder
{
const PROTOCOL_VERSION = 2;
protected $sensors;
public function decode($payload = '')
{
$bytes = hex2bin($payload);
$parts = [];
$parts['version'] = ord($bytes[0]);
if ($parts['version'] != self::PROTOCOL_VERSION) {
$parts['error'] = sprintf("protocol version %u doesn't match v2", $parts['version']);
return $parts;
}
$parts['device_id'] = unpack('n', substr($bytes, 1))[1];
$flags = unpack('n', substr($bytes, 3))[1];
/* decode payload */
$k = 5;
foreach ($this->sensors as $sensor) {
if (($flags & 1) == 1) {
$x = [];
/* convert data to 16-bit integer array */
for ($j = 0; $j < $sensor['length']; $j++) {
array_push($x, unpack('n', substr($bytes, $k))[1]);
$k += 2;
}
/* decode sensor values */
foreach ($sensor['values'] as $value) {
if ($value['convert'] != NULL) {
$parts[$value['name'] . '_value'] = $value['convert']($x);
if ($value['unit'] != NULL) {
$parts[$value['name'] . '_unit'] = $value['unit'];
}
}
}
}
$flags >>= 1;
}
return $parts;
}
}
class DL_SDD_Decoder extends DecentlabDecoder {
public function __construct()
{
$this->sensors = [
[
'length' => 18,
'values' => [
[
'name' => 'moisture_at_level_0',
'convert' => function ($x) { return ($x[0] - 32768) / 100; },
'unit' => '%',
],
[
'name' => 'moisture_at_level_1',
'convert' => function ($x) { return ($x[1] - 32768) / 100; },
'unit' => '%',
],
[
'name' => 'moisture_at_level_2',
'convert' => function ($x) { return ($x[2] - 32768) / 100; },
'unit' => '%',
],
[
'name' => 'moisture_at_level_3',
'convert' => function ($x) { return ($x[3] - 32768) / 100; },
'unit' => '%',
],
[
'name' => 'moisture_at_level_4',
'convert' => function ($x) { return ($x[4] - 32768) / 100; },
'unit' => '%',
],
[
'name' => 'moisture_at_level_5',
'convert' => function ($x) { return ($x[5] - 32768) / 100; },
'unit' => '%',
],
[
'name' => 'temperature_at_level_0',
'convert' => function ($x) { return ($x[6] - 32768) / 100; },
'unit' => '°C',
],
[
'name' => 'temperature_at_level_1',
'convert' => function ($x) { return ($x[7] - 32768) / 100; },
'unit' => '°C',
],
[
'name' => 'temperature_at_level_2',
'convert' => function ($x) { return ($x[8] - 32768) / 100; },
'unit' => '°C',
],
[
'name' => 'temperature_at_level_3',
'convert' => function ($x) { return ($x[9] - 32768) / 100; },
'unit' => '°C',
],
[
'name' => 'temperature_at_level_4',
'convert' => function ($x) { return ($x[10] - 32768) / 100; },
'unit' => '°C',
],
[
'name' => 'temperature_at_level_5',
'convert' => function ($x) { return ($x[11] - 32768) / 100; },
'unit' => '°C',
],
[
'name' => 'salinity_at_level_0',
'convert' => function ($x) { return $x[12] - 100; },
'unit' => NULL,
],
[
'name' => 'salinity_at_level_1',
'convert' => function ($x) { return $x[13] - 100; },
'unit' => NULL,
],
[
'name' => 'salinity_at_level_2',
'convert' => function ($x) { return $x[14] - 100; },
'unit' => NULL,
],
[
'name' => 'salinity_at_level_3',
'convert' => function ($x) { return $x[15] - 100; },
'unit' => NULL,
],
[
'name' => 'salinity_at_level_4',
'convert' => function ($x) { return $x[16] - 100; },
'unit' => NULL,
],
[
'name' => 'salinity_at_level_5',
'convert' => function ($x) { return $x[17] - 100; },
'unit' => NULL,
],
],
],
[
'length' => 18,
'values' => [
[
'name' => 'moisture_at_level_6',
'convert' => function ($x) { return ($x[0] - 32768) / 100; },
'unit' => '%',
],
[
'name' => 'moisture_at_level_7',
'convert' => function ($x) { return ($x[1] - 32768) / 100; },
'unit' => '%',
],
[
'name' => 'moisture_at_level_8',
'convert' => function ($x) { return ($x[2] - 32768) / 100; },
'unit' => '%',
],
[
'name' => 'moisture_at_level_9',
'convert' => function ($x) { return ($x[3] - 32768) / 100; },
'unit' => '%',
],
[
'name' => 'moisture_at_level_10',
'convert' => function ($x) { return ($x[4] - 32768) / 100; },
'unit' => '%',
],
[
'name' => 'moisture_at_level_11',
'convert' => function ($x) { return ($x[5] - 32768) / 100; },
'unit' => '%',
],
[
'name' => 'temperature_at_level_6',
'convert' => function ($x) { return ($x[6] - 32768) / 100; },
'unit' => '°C',
],
[
'name' => 'temperature_at_level_7',
'convert' => function ($x) { return ($x[7] - 32768) / 100; },
'unit' => '°C',
],
[
'name' => 'temperature_at_level_8',
'convert' => function ($x) { return ($x[8] - 32768) / 100; },
'unit' => '°C',
],
[
'name' => 'temperature_at_level_9',
'convert' => function ($x) { return ($x[9] - 32768) / 100; },
'unit' => '°C',
],
[
'name' => 'temperature_at_level_10',
'convert' => function ($x) { return ($x[10] - 32768) / 100; },
'unit' => '°C',
],
[
'name' => 'temperature_at_level_11',
'convert' => function ($x) { return ($x[11] - 32768) / 100; },
'unit' => '°C',
],
[
'name' => 'salinity_at_level_6',
'convert' => function ($x) { return $x[12] - 100; },
'unit' => NULL,
],
[
'name' => 'salinity_at_level_7',
'convert' => function ($x) { return $x[13] - 100; },
'unit' => NULL,
],
[
'name' => 'salinity_at_level_8',
'convert' => function ($x) { return $x[14] - 100; },
'unit' => NULL,
],
[
'name' => 'salinity_at_level_9',
'convert' => function ($x) { return $x[15] - 100; },
'unit' => NULL,
],
[
'name' => 'salinity_at_level_10',
'convert' => function ($x) { return $x[16] - 100; },
'unit' => NULL,
],
[
'name' => 'salinity_at_level_11',
'convert' => function ($x) { return $x[17] - 100; },
'unit' => NULL,
],
],
],
[
'length' => 1,
'values' => [
[
'name' => 'battery_voltage',
'convert' => function ($x) { return $x[0] / 1000; },
'unit' => 'V',
],
],
],
];
}
}
$decoder = new DL_SDD_Decoder();
$payloads = [
'0243e300058000800080008000800080008741877b8749876c876c876600000000000000000000014a09e3',
'0243e3000409e3',
];
foreach($payloads as $payload) {
var_dump($decoder->decode($payload));
}