I added support for read and write filters. This allows users to write data to a specific tag or read only tags that match your filter. It also supports custom configurations, allowing users to collect different sets of metadata and specify an off-time in continuous reading (amongst others). Made significant changes to the code, especially on the response part, which hopefully increases readability. Added more opcodes, like the 0x23(write EPC) that does not overwrite past the EPC bank.

Issues currently:

1. no support for the hecto because I used an earlier version
2. examples do not always work because the invocation for getting data has changed

The code is in working condition. I included a Test firmware under the Advanced examples that tests request building and response parsing. I also included a generic reader writer firmware and firmware that can communicate with MQTT brokers (for the Arduino R4 WiFi Board).

Let me know if it can be added to the main repository.