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<?php |
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declare(strict_types=1); |
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namespace Uro\TeltonikaFmParser; |
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use Uro\TeltonikaFmParser\Exception\ParserException; |
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use Uro\TeltonikaFmParser\Model\Data; |
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use Uro\TeltonikaFmParser\Model\Imei; |
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class TcpDecoder implements Decoder |
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{ |
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public function isAuthentication(string $payload): bool |
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{ |
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$firstByte = substr($payload, 0, 8); |
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return hexdec($firstByte) !== 0; |
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} |
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public function isData(string $payload): bool |
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{ |
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return !$this->isAuthentication($payload); |
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} |
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public function decodeAuthentication(string $payload): Imei |
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{ |
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$hexImei = substr($payload, 4); |
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return Imei::createFromHex($hexImei); |
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} |
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/** |
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* @todo: Finish CRC, and Sensors |
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* |
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* @param string $payload |
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* |
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* @return array |
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* @throws ParserException |
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*/ |
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public function decodeData(string $payload): array |
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{ |
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$crc = substr($payload, \strlen($payload) - 8, 8); |
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$avlDataWithChecks = substr($payload, 16, -8); |
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// Validating number of data; |
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if (substr($avlDataWithChecks, 2, 2) !== substr($avlDataWithChecks, \strlen($avlDataWithChecks) - 2, 2)) { |
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throw new ParserException('First element count check is different than last element count check'); |
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} |
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$numberOfElements = hexdec(substr($avlDataWithChecks, 2, 2)); |
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$avlData = substr($avlDataWithChecks, 4, -2); |
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$position = 0; |
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$resultData = []; |
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for ($i = 0; $i < $numberOfElements; $i++) { |
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$resultData[] = Data::createFromHex($avlData, $position); |
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} |
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return $resultData; |
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} |
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} |
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uro /
teltonika-fm-parser
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