[Bug]: Set serviceType to null (hex 0x00)

[anupama-pathirage]

Description

Moving issue from https://github.com/wso2-extensions/esb-connector-smpp/issues/16

Description:
Hi, please rewrite this code

public void setServiceType(String serviceType) {
        if (StringUtils.isEmpty(serviceType)) {
            serviceType = SMPPConstants.CMT;
        }
        this.serviceType = serviceType;
}

in SMSDTO.java file.

If ServiceType null, this connector addet "CMT" string to ServiceType, but according to SMPP specification need hex 0x00 (default). My SMSC acceptance only hex 0x00 in ServiceType. Therefore, I can not be used this connector.

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