User's Manual

connected device supports those services as server role. Command “Q” lists the
UUIDs of services that current device support as client role and connected peer
support as server role.
Default: No Connection
Example: Q // Display the connection status
3.3.2.12 R,1
Command “R” forces a complete device reboot (similar to a power cycle). It has one
mandatory parameter of “1”. After rebooting RN4020, all prior setting change takes
effective.
Example: R,1 // Reboot RN4020
3.3.2.13 T,<interval>,<latency>,<timeout>
Command “T” is used to change connection parameters interval, latency and timeout
for current connection. The parameters of command “T” is lost after power cycle. All
parameters are 16-bit value in hex format. Command “T” is only effective if active
connection exists when the command is issued.
For the definitions, ranges and relationships of connection interval, latency and
timeout, please refer section 3.2.1.15 for command “ST” and table 6 for details.
When command “T” with valid parameters is issued by peripheral device, minimum
interval of Timeout is required between two connection parameter update requests.
Also, whether to accept the connection parameter update request is up to the
central device. When RN4020 acts as central device, it accepts all valid connection
parameter update requests.
Default: Interval: 20; Latency: 0; Timeout: 200
Example: T,0190,0001,03E8 // Request Connection Parameter
// to be interval 400ms, latency 1
// and timeout 1000ms
3.3.2.14 U
Command “U” removes existing bonding. It expects no parameter and could be
issued by either central or peripheral.