Where can I find a RFCOMM code sample?
For a complete code sample that details RFCOMM operation, see the Bluetooth Rfcomm Chat Sample on Github. When sending a file, the most basic scenario is to connect to a paired device based on a desired service. This involves the following steps:
How do I connect to a Bluetooth device using Linux?
In Linux, open up a terminal and check what bluetooth services are available by typing in sdptool browse local If you already have a serial port service, make a note of what channel it is. If you don’t, you can add the service: sdptool add –channel=22 SP Now listen on this channel using rfcomm: sudo rfcomm listen /dev/rfcomm0 22
Can I use RFCOMM to send messages back to the connected device?
Apparently rfcomm will create /dev/rfcomm0 upon a successful connection. Once that happens, I’d like to use something like cutecom to send messages back and forth to the connected device. On my Android device I open up a Bluetooth SPP terminal (there are several out there, I tried a few different ones) and try to connect.
Does the RFCOMM API support 16-bit GUIDs?
The RFCOMM API offers a wrapper for service identifiers that allows them be specified and consumed as 128-bit GUIDs as well as 32-bit integers but does not offer 16-bit integers. This is not an issue for the API because languages will automatically upsize to a 32-bit integer and the identifier can still be correctly generated.
How do I use RFCOMM with Bluetooth devices?
To establish an RFCOMM connection with another Bluetooth device, incoming or outgoing, create and fill out a struct sockaddr_rcaddressing structure. Like the struct sockaddr_inthat is used in TCP/IP, the addressing structure specifies the details of an outgoing connection or listening socket.
How do I persist an RFCOMM service in the background?
When a connection is received, store the connected socket for later processing. Follow established data stream patterns to read chunks of data from the socket’s InputStream and save it to a file. In order to persist an RFCOMM service in the background, use the RfcommConnectionTrigger.