error = port:read([bytesToRead])
Sends an asynchronous request for a read operation. When the request is serviced, the readCallback is called to confirm completion, if previously specified with setReadListener. Returns error if an error occurred.
|
Parameter |
Type |
Description |
|---|---|---|
|
port |
in port object |
The port to read from. |
|
bytesToRead |
in number |
Amount of bytes to read. Must be in the interval [1..1024]. By default 1024 is used if no amount is specified. |
|
error |
out string (optional) |
If request is successfully queued up, nil is returned; an error message otherwise. |
Introduced in platform.apiLevel = '2.7'.