Blockwise transfer

[deavmi]

Good morning, I have been working on getting a blockwise transfer working as part of a POST request.

I effectively have a large amount of data I want to send, I want the Java CoAP library to handle the block transfer, and once done have it unblock from the future to be able to obtain the fully reassembled payload.

I have been struggling to get this right, so far this is the code I have going:

/**
* Grab a hold of the resource as a target for our POST.
* 
* Then pack into the request our DLMS xAPDU with the
* DLMS content type.
* 
* Then also set the headers:
*/
String uriHostStr = (this.remoteHost.getAddress()+":"+this.remoteHost.getPort()).replace("/", "");
log.warning("Computed URI host string: '"+uriHostStr+"'");

CoapRequestTarget resourceTarget = this.client.resource(this.resourcePath)
  .payload(payloadToSend, this.contentType)
  .con()
  .host(uriHostStr)
  .token(getAToken());
//  .query("");

// Pack the headers in
resourceTarget = packHeaderOptions(resourceTarget);



log.finer("POST to be sent: '"+resourceTarget+"'");

// Now POST it and wait for it to complete
CompletableFuture<CoapPacket> postFuture = resourceTarget.post(); 

// Wait for the response Coap packet
CoapPacket postResp = postFuture.get();
log.finer("Post response: '"+postResp+"'");

byte[] responsePayload = postResp.getPayload();
log.info("Post payload: '"+Arrays.toString(responsePayload)+"'");

How could I go about this? (Below is attached one of the ways I need to accomplish this)