Const
Arbitrary for valid MQTT UTF-8 strings (1-65535 bytes when encoded).
Excludes null characters, isolated surrogates, and control characters prohibited by the MQTT 5.0 spec (ยง1.5.4).
Arbitrary for valid MQTT UTF-8 strings (1-65535 bytes when encoded).
Excludes null characters, isolated surrogates, and control characters prohibited by the MQTT 5.0 spec (ยง1.5.4).