Describe the current status of the project

I added a TODO section in which I listed a list of complete
and incomplete tasks.
This will allow us to move forward with the project in the future.

sdi/README.md

@@ -150,3 +150,111 @@ Any attempts from SdI will only be visible in the simulation section
 of the "Manage the channel" interface.
 
 ---
+
+## TODO
+
+- [X] completed tasks
+- [ ] uncompleted tasks
+
+Below is a checklist.
+It is intended to help us determine the current status of the project.
+
+### Sending invoices
+
+The functionality related to sending invoices
+and simple invoices works correctly (tested in test env for SdI).
+The status of sent invoices is visible
+in the "Interoperability Test" section of "Manage the channel".
+
+- [X] Sending invoices to SdI
+  - [X] Building the client along with configuration
+  - [X] Preparation of SOAP request for SdI
+  - [X] Creation of "transmit" command for CLI
+  - [X] Adding SSL support to the HTTP client for sending invoices
+- [X] Receiving responses after sending invoices:
+  - [X] Parses a multipart HTTP response (XOP+XML)
+  - [X] Deserialization of response into appropriate structure
+- [X] Handling errors:
+  - [X] Empty invoice (File vuoto)
+  - [X] Service unavailable (Servizio non disponibile)
+  - [X] Unauthorized user (Utente non abilitato)
+  - [X] File type not correct (Tipo file non corretto)
+- [X] Preparation of structures for Message Types (based on MessaggiTypes_v1.1.xsd)
+
+### Receiving invoices
+
+The functionality of receiving invoices and notifications is not working
+because we couldn't configure SSL communication correctly.
+When we send an invoice to the recipient specified in the "Manage the channel"
+simulation section, the our server should receive it.
+SdI makes three attempts to deliver the invoice or notification.
+However, for this to happen, SdI tries to authenticate the server
+it sends data to at the SSL level.
+
+If any requests were to arrive, we would see them in the server logs.
+Currently, the status of sent requests is visible only in "Manage the channel",
+with the following message:
+
+> javax.net.ssl.SSLHandshakeException [1]: General SSLEngine problem
+
+Despite SSL issues, some tasks were successfully completed (based on tests).
+
+- [ ] Receiving invoices from SdI
+  - [X] Simple HTTP server listening on the selected port
+  - [X] Adding SSL support to the HTTPS server
+  - [X] Building a message handler
+  - [ ] Handling transmission service endpoint (out)
+  - [ ] Handling reception service endpoint (in)
+  - [X] Creation of "server" command for CLI
+  - [ ] Parsing request from SdI with the invoice
+  - [ ] Assign parsed invoice to GOBL format
+- [ ] Receiving notifications from SdI
+  - [X] Handling different SdI requests
+  - [ ] Receiving actual requests from SDI for testing purposes
+  - [X] Mocking real communication with SDI for testing purposes
+- [X] Parsing SDI messages:
+  - [X] Rejection Receipt (RicevutaScarto)
+  - [ ] Invoice Transmission Confirmation (AttestazioneTrasmissioneFattura)
+  - [X] File Submission Metadata (MetadatiInvioFile)
+  - [ ] Delivery Failure Notification (NotificaMancataConsegna)
+- [ ] Server configuration
+  - [X] Analysis of requirements needed for server configuration
+  - [ ] Setting up the server for "Interoperability Tests"
+  - [ ] Setting up the server for production
+- [X] Preparing the structure based on XSD files:
+  - [X] Invoice Data Message (DatiFatturaMessaggi_v2.0.xsd)
+  - [X] Receipt Types (RicezioneTypes_v1.0.xsd)
+  - [X] Submission File Types
+  - [X] Transmission File Types (TrasmissioneFileTypes_v2.0.xsd)
+  - [X] Transmission Types (TransmissioneTypes_v1.1.xsd)
+
+The above tasks likely do not cover all the preparations required.
+However, without the ability to receive requests from SdI,
+the development process is hindered.
+
+### Interoperability Test
+
+To pass the "Interoperability Test", a correctly configured environment
+with an active server is required. SdI does not allow the use of two different
+certificates, so the staging environment should be on the same domain
+as the production environment. The difference may lie in a different path,
+which can be set in the "Change Endpoint" section of "Manage the Channel".
+
+Necessary tests to pass:
+
+- [ ] Invoice Reception (Ricezione Fattura)
+- [ ] Delivery Receipt (Ricevuta consegna)
+- [ ] Non-Delivery Notification (B2G)/Undeliverable Notification (B2B, B2C) (Notifica mancata consegna (B2G)/Notifica impossibilità di recapito (B2B, B2C))
+- [ ] Rejection Notification (B2G)/Rejection Receipt (B2B, B2C) (Notifica scarto (B2G)/Ricevuta di scarto (B2B, B2C))
+
+Further tests for FatturaPA:
+
+- [ ] Outcome Notification from PA (Notifica di esito da PA)
+- [ ] Rejection Notification of Outcome to PA (Notifica di Scarto esito a PA)
+- [ ] Deadline Notification to PA (Notifica Decorrenza Termini a PA)
+- [ ] Outcome Notification to Economic Operator (Notifica esito a Operatore Economico)
+- [ ] Deadline Notification to Economic Operator (Notifica Decorrenza Termini a Operatore Economico)
+- [ ] Transmission Confirmation (Attestazione avvenuta trasmissione)
+
+After successfully passing the interoperability tests, SdI will be unlocked
+to communicate with the production environment of the SDICoop Web Service.