Use gitbook to manage documentation

Signed-off-by: Sebastien Douheret <sebastien.douheret@iot.bzh>

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+# Install AFB Websocket CLI client to test the binding.
+
+You can test it using afb-client-demo CLI tool provided by the RPM package *libafbwsc-dev*.
+
+You can find this package in your build environment, using docker SDK recommended setup the file is `/xdt/build/tmp/deploy/rpm/<your-target-arch>/`.
+
+After a successful bitbake build and using Renesas RCar Gen2, Porter, you have to copy the file if your board is connected to your network and you know its IP address:
+
+```bash
+$ scp /xdt/build/tmp/deploy/rpm/cortex15hf_neon/libafbwsc-dev-1.0-r0.cortexa15hf_neon.rpm root@<target_IP>:~
+```
+
+Else, you have to copy into the SDcard with the AGL image installed on it.
+
+From the docker image copy RPM to the shared directory between docker image and your host:
+
+```bash
+$ cp /xdt/build/tmp/deploy/rpm/cortex15hf_neon/libafbwsc-dev-1.0-r0.cortexa15hf_neon.rpm ~/share
+```
+
+Then plugin you SDcard in your Linux host (Windows can't read ext4 filesystem AGL runs on) and copy RPM file on it.
+
+From your host, identify SDcard block device node here it is **sdc** with the correct capacity automounted by the desktop manager:
+
+```bash
+$ lsblk
+loop1                                                                                     7:1    0     2G  0 loop
+└─docker-253:0-3146365-pool                                                             253:3    0   100G  0 dm
+  └─docker-253:0-3146365-e9f80849a2681e18549d3a4238cbf031e44052e36cd88a0abf041804b799b61c
+    253:4    0    10G  0 dm   /var/lib/docker/devicemapper/mnt/e9f80849a2681e18549d3a4238cbf031e44052e36cd88a0abf041804b799b61c
+sdb                                                                                       8:16   0 238.5G  0 disk
+├─sdb2                                                                                    8:18   0   238G  0 part
+│ └─Shamash-agl                                                                         253:1    0   238G  0 lvm  /home/claneys/Workspace/agl-docker
+└─sdb1                                                                                    8:17   0   500M  0 part /boot
+sr0                                                                                      11:0    1  1024M  0 rom
+loop0                                                                                     7:0    0   100G  0 loop
+└─docker-253:0-3146365-pool                                                             253:3    0   100G  0 dm
+  └─docker-253:0-3146365-e9f80849a2681e18549d3a4238cbf031e44052e36cd88a0abf041804b799b61c
+    253:4    0    10G  0 dm   /var/lib/docker/devicemapper/mnt/e9f80849a2681e18549d3a4238cbf031e44052e36cd88a0abf041804b799b61c
+sdc                                                                                       8:32   1  14.9G  0 disk
+└─sdc1                                                                                    8:33   1     2G  0 part /run/media/claneys/97f418a5-612f-44e9-b968-a19505695151
+sda                                                                                       8:0    0 931.5G  0 disk
+├─sda2                                                                                    8:2    0   500G  0 part
+│ ├─Shamash-home                                                                        253:2    0   150G  0 lvm  /home
+│ └─Shamash-root                                                                        253:0    0    50G  0 lvm  /
+└─sda1                                                                                    8:1    0    16G  0 part [SWAP]
+```
+
+Copy, still from your host:
+
+> **CAUTION** Make sure to sync IO with sync command before unplug your SDcard. It could be corrupted if removed before all pending IO aren't done.
+
+```bash
+$ sudo cp ~/devel/docker/share/libafbwsc-dev-1.0-r0.cortexa15hf_neon.rpm /run/media/claneys/97f418a5-612f-44e9-b968-a19505695151/home/root
+$ sync
+```
+
+Insert the modified SDcard in your Porter board and boot from it. You are ready to go.
+
+## Configure the AGL system
+
+### Virtual CAN device
+
+ Connected to the target, here is how to load the virtual CAN device driver and set up a new vcan device :
+
+```bash
+# modprobe vcan
+# ip link add vcan0 type vcan
+# ip link set vcan0 up
+ ```
+
+### CAN device using the USB CAN adapter
+
+Using real connection to CAN bus of your car using the USB CAN adapter connected to the OBD2 connector.
+
+Once connected, launch ```dmesg``` command and search which device to use :
+
+```bash
+# dmesg
+[...]
+[  131.871441] usb 1-3: new full-speed USB device number 4 using ohci-pci
+[  161.860504] can: controller area network core (rev 20120528 abi 9)
+[  161.860522] NET: Registered protocol family 29
+[  177.561620] usb 1-3: USB disconnect, device number 4
+[  191.061423] usb 1-2: USB disconnect, device number 3
+[  196.095325] usb 1-2: new full-speed USB device number 5 using ohci-pci
+[  327.568882] usb 1-2: USB disconnect, device number 5
+[  428.594177] CAN device driver interface
+[ 1872.551543] usb 1-2: new full-speed USB device number 6 using ohci-pci
+[ 1872.809302] usb_8dev 1-2:1.0 can0: firmware: 1.7, hardware: 1.0
+[ 1872.809356] usbcore: registered new interface driver usb_8dev
+```
+
+Here device is named **can0**.
+
+This instruction assuming a speed of 500000kbps for your CAN bus, you can try others supported bitrate like 125000, 250000 if 500000 doesn't work:
+
+```bash
+# ip link set can0 type can bitrate 500000
+# ip link set can0 up
+# ip link show can0
+  can0: <NOARP,UP,LOWER_UP,ECHO> mtu 16 qdisc pfifo_fast state UNKNOWN qlen 10
+    link/can
+    can state ERROR-ACTIVE (berr-counter tx 0 rx 0) restart-ms 0
+    bitrate 500000 sample-point 0.875
+    tq 125 prop-seg 6 phase-seg1 7 phase-seg2 2 sjw 1
+    sja1000: tseg1 1..16 tseg2 1..8 sjw 1..4 brp 1..64 brp-inc 1
+    clock 16000000
+```
+
+## Configure the binding
+
+Configure the binding specifying in the JSON configuration file the CAN device(s) that it will to connect to. Edit file */var/lib/afm/applications/low-can-binding/0.1/can_buses.json* and change the CAN device name to the one you have :
+
+```json
+{
+	"canbus":  "can0"
+}
+```
+
+If you have several specify CAN bus devices use an array:
+
+```json
+{
+	"canbus": [ "vcan0", "can0" ]
+}
+```
+
+> **WARNING** Make sure the CAN bus(es) you specify in your configuration file match those specified in your generated source file with the [can-config-generator](http://github.com/iotbzh/can-config-generator).
+
+## Run it, test it, use it !
+
+You can run the binding using **afm-util** tool, here is the classic way to go :
+
+```bash
+# afm-util run low-can-binding@0.1
+1
+```
+
+You can find instructions to use afm-util tool [here](http://docs.iot.bzh/docs/apis_services/en/dev/reference/af-main/afm-daemons.html#using-afm-util), as well as documentation about Application Framework.
+
+But you can't control nor interact with it because you don't know security token that **Application Framework** gaves it at launch.
+
+So, to test it, it is better to launch the binding manually. In the following example, we will use port **1234** and left empty security token for testing purpose:
+
+```bash
+# afb-daemon --ldpaths=/usr/lib/afb:/var/lib/afm/applications/low-can-binding/0.1/libs/ --rootdir=/var/lib/afm/applications/low-can-binding/0.1/ --port=1234 --token=
+NOTICE: binding [/usr/lib/afb/afb-dbus-binding.so] calling registering function afbBindingV1Register
+NOTICE: binding /usr/lib/afb/afb-dbus-binding.so loaded with API prefix dbus
+NOTICE: binding [/usr/lib/afb/authLogin.so] calling registering function afbBindingV1Register
+NOTICE: binding /usr/lib/afb/authLogin.so loaded with API prefix auth
+NOTICE: binding [/var/lib/afm/applications/low-can-binding/0.1/libs//low-can-binding.so] calling registering function afbBindingV1Register
+NOTICE: binding /var/lib/afm/applications/low-can-binding/0.1/libs//low-can-binding.so loaded with API prefix low-can
+NOTICE: Waiting port=1234 rootdir=/var/lib/afm/applications/low-can-binding/0.1/
+NOTICE: Browser URL= http:/*localhost:1234
+NOTICE: vcan0 device opened and reading {binding low-can}
+NOTICE: Initialized 1/1 can bus device(s) {binding low-can}
+```
+
+Then connect to the binding using previously installed ***AFB Websocket CLI*** tool :
+
+```bash
+# afb-client-demo ws://localhost:1234/api?token=
+```
+
+You will be on an interactive session where you can communicate directly with the binding API.
+
+The binding provides at this moment 2 verbs, *subscribe* and *unsubscribe*, which can take argument by a JSON **event** object.
+
+The argument value is the CAN message **generic_name** as described in the JSON file used to generate cpp file for the binding.
+
+To use the ***AFB Websocket CLI*** tool, a command line will be like the following :
+
+```
+<api> <verb> <arguments>
+```
+
+Where:
+
+- API : ***low-can***.
+- Verb : ***subscribe*** or ***unsubscribe***
+- Arguments : ***{ "event": "driver.doors.open" }***
+
+### Subscription and unsubscription
+
+You can ask to subscribe to chosen CAN event with a call to *subscribe* API verb with the CAN messages name as JSON argument.
+
+> **Note** If no argument is provided, then you'll subscribe to all signals at once.
+
+For example from a websocket session:
+
+```json
+low-can subscribe { "event": "doors.driver.open" }
+ON-REPLY 1:low-can/subscribe: {"jtype":"afb-reply","request":{"status":"success","uuid":"a18fd375-b6fa-4c0e-a1d4-9d3955975ae8"}}
+```
+
+Subscription and unsubscription can take wildcard in their *event* value.
+
+To reveive all doors events :
+
+```json
+low-can subscribe { "event" : "doors*" }
+ON-REPLY 1:low-can/subscribe: {"jtype":"afb-reply","request":{"status":"success","uuid":"511c872e-d7f3-4f3b-89c2-aa9a3e9fbbdb"}}
+```
+
+Then you will receive an event each time a CAN message is decoded for the event named *doors.driver.open*
+
+```json
+ON-EVENT low-can/messages.doors.driver.open({"event":"low-can\/messages.doors.driver.open","data":{"name":"messages.doors.driver.open","value":true},"jtype":"afb-event"})
+```
+
+Notice that event shows you that the CAN event is named *messages.doors.driver.open* but you ask for event about *doors.driver.open*.
+
+This is because all CAN messages or diagnostic messages are prefixed by the JSON parent node name, **messages** for CAN messages and **diagnostic_messages** for diagnostic messages like OBD2.
+
+This will let you subscribe or unsubcribe to all signals at once, not recommended, and better make filter on subscribe operation based upon their type. Examples:
+
+```json
+low-can subscribe { "event" : "*speed*" } --> will subscribe to all messages with speed in their name. Search will be make without prefix for it.
+low-can subscribe { "event" : "speed*" } --> will subscribe to all messages begin by speed in their name. Search will be make without prefix for it.
+low-can subscribe { "event" : "messages*speed*" } --> will subscribe to all CAN messages with speed in their name. Search will be on prefixed messages here.
+low-can subscribe { "event" : "messages*speed" } --> will subscribe to all CAN messages ending with speed in their name. Search will be on prefixed messages here.
+low-can subscribe { "event" : "diagnostic*speed*" } --> will subscribe to all diagnostic messages with speed in their name. Search will be on prefixed messages here.
+low-can subscribe { "event" : "diagnostic*speed" } --> will subscribe to all diagnostic messages ending with speed in their name. Search will be on prefixed messages here.
+```
+
+You can stop receiving event from it by unsubscribe the signal the same way you did for subscribe
+
+```json
+low-can unsubscribe { "event": "doors.driver.open" }
+ON-REPLY 2:low-can/unsubscribe: {"jtype":"afb-reply","request":{"status":"success"}}
+low-can unsubscribe { "event" : "doors*" }
+ON-REPLY 3:low-can/unsubscribe: {"jtype":"afb-reply","request":{"status":"success"}}
+```