Connect RPI with Bangle and send data

I think what you've got is this line:

command = "X('+json.dumps(dict)+')/n"

Note that you're using two different types of quotes - so you're actually just sending the string X('+json.dumps(dict)+')/n which is exactly what Espruino is seeing.

If you did:

command = "X("+json.dumps(dict)+")/n"

Then you may have more success - that should actually send the data in dict rather than just the text json.dumps(dict).