TCP/ip connect and maintain connection

[Azar]

Like this:

Code:

value = GetCBusLevel(0,  127, 10)
command = 'CS 34 ' .. (value * 257) .. ‘\r'
sock:send(command)

I'm getting a error

Lua syntax error at line 9: unexpected symbol near '\'

How do I get "value x 257" into "command" so that it can be sent