Websocket code only works in interactive session

[br00t-coursera]

I don't know if this is readily fixable, but I thought I would ask...

1. Create a script called websocketscript.R with the following contents:

#!/usr/bin/Rscript
library(websocket)

ws <- WebSocket$new("ws://echo.websocket.org/", autoConnect = FALSE)
ws$onOpen(function(event) {
  cat("Connection opened\n")
})
ws$onMessage(function(event) {
  cat("Client got msg: ", event$data, "\n")
})
ws$onClose(function(event) {
  cat("Client disconnected with code ", event$code,
    " and reason ", event$reason, "\n", sep = "")
})
ws$onError(function(event) {
  cat("Client failed to connect: ", event$message, "\n")
})
ws$connect()
Sys.sleep(1)
ws$send('hello')
ws$close()

2. make the script executable ... chmod a+x websocketscript.R
3. run the script in the shell ... ./websocketscript.R

Is there any way for this to work as it would in an interactive session? I gather the problem is related to the fact that the process terminates before the callbacks ever execute? I have tried such hacky foolishness in the shell as:

R < websocketscript.R --interactive

printf source('websocketscript.R') | Rscript --interactive websocketscript.R

No joy. Thoughts?

> sessionInfo()
R version 3.6.3 (2020-02-29)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 18.04.4 LTS

Matrix products: default
BLAS:   /usr/lib/x86_64-linux-gnu/blas/libblas.so.3.7.1
LAPACK: /usr/lib/x86_64-linux-gnu/lapack/liblapack.so.3.7.1

locale:
 [1] LC_CTYPE=en_CA.UTF-8       LC_NUMERIC=C              
 [3] LC_TIME=en_CA.UTF-8        LC_COLLATE=en_CA.UTF-8    
 [5] LC_MONETARY=en_CA.UTF-8    LC_MESSAGES=en_CA.UTF-8   
 [7] LC_PAPER=en_CA.UTF-8       LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C            
[11] LC_MEASUREMENT=en_CA.UTF-8 LC_IDENTIFICATION=C       

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

loaded via a namespace (and not attached):
 [1] websocket_1.1.0.9001 compiler_3.6.3       processx_3.4.2      
 [4] R6_2.4.1             Matrix_1.3-0         RcppRedis_0.1.10    
 [7] later_1.0.0.9002     Rcpp_1.0.4           reticulate_1.15     
[10] RApiSerialize_0.1.0  codetools_0.2-16     grid_3.6.3          
[13] jsonlite_1.6.1       ps_1.3.2             lattice_0.20-41

Thanks!

[br00t-coursera]

Duplicate of #52