B4J Question B4J Serial port communication

[rameshb]

Hi all,
I want to implement serial port communication in B4J.
I have gone through chat sample application downloaded from http://www.b4x.com/android/forum/threads/jserial-library.34762/
but i still have following queries.

a.How can we specify input and output buffer size?
b.In asyncstream_newdata event,it is showing only 16 bytes in buffer array.
how can we retrieve other recieved bytes if received data length exceeds 16 bytes?
c.How to poll the length of receive buffer in case event based communication is not used.
(streamtotal property is there but it is showing as 0 and in intellisense it is showing as valid only in prefix mode.)

Thanks in advance.

 

[Erel]

There is no buffer in AsyncStreams.

AsyncStreams (in non prefix mode) raises the NewData event whenever there is data available. You are responsible for collecting the data.

You can use a List or an array to collect it.

 

[rameshb]

yes erel,
i actually received 36 bytes of data (when viewed through serial port monitor application) on port.
But in asyncstream_newdata event procedure Buffer argument value is showing only as a 16 byte array.
I also put a log statement to check how many times that event is raised,but it is raised only one time and with 16 bytes of buffer data array.

Where have other 20 bytes gone?

Am i missing anything?..

Please suggest some workaround as i am new to this B4J platform.

 

[Erel]

Can you post your code?

 

[rameshb]

Hi erel,
Attached my code.

 

[rameshb]

I am taking hex input and sending them as bytes on serial port.

 

[Erel]

Your code doesn't do anything in NewData.

You should assume that messages will be split. However AsyncStreams passes all the data that it receives as is.