addIfMatch method
Add an if match option, if a null string is passed the if match is not set
Implementation
void addIfMatch(final String etag) =>
addOption(CoapOption.createString(OptionType.ifMatch, etag));
Add an if match option, if a null string is passed the if match is not set
void addIfMatch(final String etag) =>
addOption(CoapOption.createString(OptionType.ifMatch, etag));