8.13. RF_ConnectionInterval: Modify the connection interval
Settings
index
Designation
Permissible
values
Default value
Permissions
Number
of
Bytes
8
See
description
15-50
read/write
4
The user setting
defines the minimum and maximum connection
interval, which is used to negotiate the connection interval during connection setup.
The 4 byte value of the user setting
consists of the 2 byte value
of the minimum connection interval, followed by the 2 byte value of the maximum connection
interval (see the examples below).
The value for the minimum connection interval, and the value for the maximum connection
interval must be within 8 ms and 4000 ms. Only settings are accepted where the minimum
connection interval is lower or equal to the maximum connection interval.
Further information:
• The minimum and maximum connection interval parameters specify the borders of the
connection interval as determined in the negotiation procedure between the central
and the peripheral during connection setup. The connection interval defines the fre-
quency of communication during connection setup and data transmission. The lower
the connection interval is, the more frequently the connected devices communicate
with each other and thus the more power is consumed.
If a Bluetooth
®
LE device (e.g. a smart phone) connects as central to a Proteus-e
module (peripheral) and the connection interval settings do not coincide, the Proteus-e
requests the smart phone to accept its settings after 5 s. If the cell phone does not
accept the settings, it will be requested a further 3 times with a delay of 10 s. If the
peripheral’s settings request have been rejected in all cases the connection will be
shut down. If the smart phone itself requests to update the connection interval of the
Proteus-e, the module accepts the request.
Please ensure that all members (Proteus-e,
cell phones and other
Bluetooth
®
LE devices) of a network use the same connection timing param-
eters to avoid connection problems and changes of the connection interval
during an opened connection.
Please check the minimum connection interval that is supported by iOS is
15 ms. Furthermore the minimum connection interval for Apple devices must
be modulo 15 ms!
8.13.1. Example 1
Set the
to 16-40 ms (0x0010-0x0028) using
with set-
tings index 8.
Proteus-e reference manual version 0.3
© November 2021
www.we-online.com/wireless-connectivity
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