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72 lines
1.4 KiB
72 lines
1.4 KiB
7 years ago
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<?php
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$json = file_get_contents("msg.json");
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$arr = json_decode($json);
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$table = [];
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foreach($arr as $msg) {
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$msg = (array)$msg;
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if ($msg['port'] == 68 && $msg['dev_id'] == 'ondrej_hruska') {
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$table[] = [
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'counter' => $msg['counter'],
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'date' => ((array)$msg['metadata'])['time'],
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'payload_raw' => $msg['payload_raw'],
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'payload' => parsePayload($msg['payload_raw']),
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];
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}
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}
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print_r($table);
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$fil = "Counter\tDate\tTemperature [°C]\tHumidity [%RH]\tPressure [hPa]\tGas_R [Ohm]\n";
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foreach($table as $row) {
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$p = $row['payload'];
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$fil .= "$row[counter]\t$row[date]\t$p[temp]\t$p[hum]\t$p[press]\t$p[gas_r]\n";
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}
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file_put_contents("msg.csv", $fil);
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function parsePayload($pl64) {
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$pl = base64_decode($pl64);
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/*
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pb_i16(&pb, voc_data.temperature); // Cx100
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pb_u16(&pb, (uint16_t) (voc_data.humidity / 10)); // discard one place -> %x100
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pb_u16(&pb, (uint16_t) (voc_data.pressure - 85000)); // send offset from 850 hPa -> Pa
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pb_u32(&pb, (uint16_t) (voc_data.gas_resistance)); // ohms, full size
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*/
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$res = [];
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$t = (ord($pl[0])<<8 | ord($pl[1]));
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if ($t&0x8000) $t = ~$t - 1;
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$res['temp'] = $t/100;
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$t = (ord($pl[2])<<8 | ord($pl[3]));
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$res['hum'] = $t/100;
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$t = (ord($pl[4])<<8 | ord($pl[5]));
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$res['press'] = (85000+$t)/100;
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$t = (ord($pl[6])<<24 | ord($pl[7])<<16 | ord($pl[8])<<8 | ord($pl[9]));
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$res['gas_r'] = $t;
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return $res;
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}
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