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Arduino Parameter Parser library allows you to parse formatted plain text. It generates data. Data types can be integer, boolean, float or string. You can fetch data with name ...

The "-" says us it's a name and comes "value" after space after name. It define "-name value". int asInt (const char* name, int ...
GitHub

Arduino_MQTT_Client.cpp

bool Arduino_MQTT_Client::publish(const char *topic, const uint8_t *payload, const size_t& length) { return m_mqtt_client.publish ...