Call to undefined function ModbusTcpClient\Network\mb_strtolower()

[Elmatbaisaad]

• Describe the problem here is my code for reading holding registers: use ModbusTcpClient\Composer\Read\ReadRegistersBuilder; use ModbusTcpClient\Network\NonBlockingClient;

require DIR . '/../vendor/autoload.php';

$ip = 'tcp://127.0.0.1:12345'; $unitID = 0; $fc3 = ReadRegistersBuilder::newReadHoldingRegisters($ip,$unitID) ->int16(0,'Register:') ->build(); $reponseContainer = (new NonBlockingClient(['readTimeoutSec' => 0.2]))->sendRequests($fc3); print_r($reponseContainer->getData()); print_r($reponseContainer->getErrors());

• I keep getting Call to undefined function ModbusTcpClient\Network\mb_strtolower() error .
• can help me.

[aldas]

You need to have PHP mbstring extension installed