There is also CNA project - it provides an interface for using native C-compatible shared libraries without anything but Caché ObjectScript code. CNA is a wrapper for libffi. CNA consists of native library (libcna) and Caché class (CNA.CNA). It is a wrapper around $zf functions (you can use them directly too).

Here's the code to call crypt using CNA:

Class CNA.Crypt
{

/// do ##class(CNA.Crypt).Crypt()
ClassMethod Crypt(key = "2Ggaobjb", salt = "$1$1a2b3c4d$")
{
    set cna = ##class(CNA.CNA).%New("/InterSystems/forCLM/libcna.so") ; Creates object of CNA.CNA class.
    do cna.LoadLibrary("/lib/x86_64-linux-gnu/libcrypt-2.23.so")      ; Loads C standard library (crypto) in CNA

    set keyPointer = cna.ConvertStringToPointer(key) ; Converts the string into char array, and saves pointer to the first element

    set saltPointer = cna.ConvertStringToPointer(salt)

    set argTypes = $lb(cna.#POINTER, cna.#POINTER)   ; function argument types
    set result = cna.CallFunction("crypt",          ; Passes the name of the function,
                                cna.#POINTER,       ; type of return value,
                                argTypes,         ; list of argument types,
                                keyPointer, saltPointer)           ; and comma-separated arguments */    
    write cna.ConvertPointerToString(result), !      
   
    do cna.FreeLibrary()
}

}

Sample output:

do ##class(CNA.Crypt).Crypt()
>$1$1a2b3c4d$Y5tt50CQ12xW2saeYnI43.

do ##class(CNA.Crypt).Crypt("ABC", "$1$12345678$") 
>$1$12345678$0QgUhxfT5h1pvtkhF5pzx/ 

SMP -> Ensemble -> Build -> Business Processes -> [Open your BP] -> Show print friendly version of diagram -> Print that page.

EnsPortal.SVG.SVGPrint.zen page outputs the SVG image so if you need you can subclass it to print SVG to file or inject into some document.

Assuming  you're on 2016.2+:

set payload = "{""profile_id"":""9XOzzcI8NfSUjxAhEt0cTLRejwmp6HPi"",""biometrics"":[{""timestamp"":""2017-05-17T13:45:40"",""utc_offset"":""+02:00"",""resting_heartrate"":120.0,""spo2"":98.0,""activity_id"":""591c540aac8f295479ee14ce""}]}"
set obj = {}.%FromJSON(payload)
write obj."profile_id"
>9XOzzcI8NfSUjxAhEt0cTLRejwmp6HPi
write obj.biometrics.%Get(0).timestamp
>2017-05-17T13:45:40

In Ensemble Visual Trace you can filter by Business Host. To do that:

1. Open Ensemble Visual Trace
2. Click on the Business Host you need
3. In Apply Filter dropdown choose the  filter you need (Host or Corresponding)
4. Visual trace would be filtered to messages sent to/from specified Business Host

 Here's how:

1. SMP > Ensemble > Production Configuration > Your Business Service > Settings > Additional Settings > Schedule > Press on the the looking glass
2. In Schedule Spec Editor press "New"
3. Specify Schedule name and press OK
4. Set "Raw String" schedule or use "Add action" specify a schedule
5. Press "Save spec"
6. Schedule setting in your Business Service should be set now
7. Restart your Business Service

Check out Demo.ZenService.Zen.WeatherReportForm class in ENSDEMO namespace. GetWeatherReport method there creates a BS and sends a message to a BP outside of Ensemble context. You need to send an object and not a datatype, so in your example:

Set tSC = tService.ProcessInput(datePurge,.output)

Should be instead:

Set message = ##class(Ens.StringContainer).%New(datePurge)
Set tSC = tService.ProcessInput(message,.output)

If you want to send a message to a BP or BO you can do that too, just create an Ensemble message and use SendSync or SendAsync to send it from BS:

Set message = ##class(Ens.StringContainer).%New(datePurge)
Set targetHostName = "Name of BP or BO"
Set description = "My request description"
// Set timeout = 10 // how long to wait for a Sync call response, skip to wait forever
// Set tSC = tService.SendRequestSync(targetHostName, message, .response, timeout, description)
Set tSC = tService.SendRequestAsync(targetHostName, message, description)

That said, Ensemble hosts can run on schedule so you can use built-in Ensemble scheduler and not a system task manager.

Ensure that user, which you are using to access the database has apropriate permissions to connect and access data.