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Generally, in Prolog, you wouldn't want to use write and a failure driven loop to show all of the solutions. A canonical approach is to have a predicate that succeeds for each solution (as your path/5 predicate does), and then use findall/3 or bagof/3 or setof/3 to collect all of the solutions in a list. setof/3 has the benefit of eliminating duplicates and ordering the resulting collection.

Here's a stackoverflow search on [prolog] shortest path directed graph. This has been covered so many times on this site, I didn't want to just pick one of them. I didn't see one that uses setof/3, so here is a solution taking that approach.

I'll use your existing definition of path/5. Since the collection of paths is unique by design, using setof/3 will be a small improvement over the use of findall/3 followed by msort/2, which you'll find in at least one of the linked solutions. The idea here is to create a list of solutions of the form Cost-Path, that are ordered by Cost. You then need to pick the lowest cost from the list, which is the first element since they are ordered.

interleaveStreams is strict in both its arguments, and streamMap is strict in it second argument, so evaluating ruler even one step requires evaluating ruler one step which requires ...

The simplest solution is to make interleaveStreams lazy in its second argument, so that you don't need to evaluate ruler recursively until you've gotten at least one value from it.

Return code -4 is a timeout trying to connect to the broker

You have to send the request to /test?params=0, not /clapMode.

Furthermore, you can modify the ID and name with

We can split the string, add the * after each word, then join the modified words together with ||:

Curl doesn't turn # into a remark. The # sign and everything that follows is not meant to be sent to the server, and therefor curl doesn't.

The part before the # is sent to the server and determines what the server sends back.

In standard HTML, that part after the# is used to scroll to an anchor or an element with the given name.

With JavaScript in the browser, the script can determine the part after the # and use this to do whatever it wants to do.

But curl is not a JavaScript Interpreter, it just fetches data from a server, so it ignores the part after #.

There's no way to pass a pointer to a non-static member function directly to aREST::function.

Non-static member functions are different than static member functions and freestanding functions. They require an object to work on. That means that &DeviceRoute::myFunction is not compatible with the type int(*)(String). Instead it's a int (DeviceRoute::*)(String).

To make this work, you need a static or freestanding wrapper function that calls the member function you want. Since aREST::function doesn't accept any sort of context pointer, your only real option is to use a global variable:

what you are doing there is reading the same file twice,so restlines read the whole file and passes the fist line which is a string and it fails. there are better way to do what you are doing but following your context,this should fix the problem change this line