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<h1 id="hci-bridge">HCI BRIDGE<a class="headerlink" href="#hci-bridge" title="Permanent link">&para;</a></h1>
<p>This tool acts as a simple bridge between two HCI transports, with a host on one side and
a controller on the other. All the HCI packets bridged between the two are printed on the console
for logging. This bridge also has the ability to short-circuit some HCI packets (respond to them
with a fixed response instead of bridging them to the other side), which may be useful when used with
a host that send custom HCI commands that the controller may not understand.</p>
<div class="admonition info">
<p class="admonition-title">Running the HCI bridge tool</p>
<p><div class="highlight"><pre><span></span><code>python hci_bridge.py &lt;host-transport-spec&gt; &lt;controller-transport-spec&gt; [command-short-circuit-list]
</code></pre></div>
The command-short-circuit-list field is specified by a series of comma separated Opcode Group
Field (OGF) : OpCode Command Field (OCF) pairs. The OGF/OCF values are specified in the Blutooth
core specification.</p>
<p>For the commands that are listed in the short-circuit-list, the HCI bridge will always generate
a Command Complete Event for the specified op code. The return parameter will be HCI_SUCCESS.</p>
<p>This feature can only be used for commands that return Command Complete. Other events will not be
generated by the HCI bridge tool.</p>
</div>
<div class="admonition example">
<p class="admonition-title">UDP to Serial</p>
<div class="highlight"><pre><span></span><code>python hci_bridge.py udp:0.0.0.0:9000,127.0.0.1:9001 serial:/dev/tty.usbmodem0006839912171,1000000 0x3f:0x0070,0x3f:0x0074,0x3f:0x0077,0x3f:0x0078
</code></pre></div>
<p>In this example, the short circuit list is specified to respond to the Vendor-specific Opcode Group
Field (0x3f) commands 0x70, 0x74, 0x77, 0x78 with Command Complete. The short circuit list can be
used where the Host uses some HCI commands that are not supported/implemented by the Controller.</p>
</div>
<div class="admonition example">
<p class="admonition-title">PTY to Link Relay</p>
<div class="highlight"><pre><span></span><code>python hci_bridge.py serial:emulated_uart_pty,1000000 link-relay:ws://127.0.0.1:10723/test
</code></pre></div>
<p>In this example, an emulator that exposes a PTY as an interface to its HCI UART is running as
a Bluetooth host, and we are connecting it to a virtual controller attached to a link relay
(through which the communication with other virtual controllers will be mediated).</p>
<p>NOTE: this assumes you're running a Link Relay on port <code>10723</code>.</p>
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