[OTA] Update README wth a more detailed multiple fabrics example (#19198

)

examples/ota-requestor-app/linux/README.md

@@ -212,7 +212,7 @@ scripts/examples/gn_build_example.sh examples/ota-provider-app/linux/ out chip_c
 **Run the OTA Provider application**
 
 ```
-out/chip-ota-provider-app --discriminator 22 --secured-device-port 5565 --KVS /tmp/chip_kvs_provider --filepath /tmp/test.bin
+out/chip-ota-provider-app --discriminator 22 --secured-device-port 5565 --KVS /tmp/chip_kvs_provider --filepath /tmp/ota-image.bin
 ```
 
 #### In terminal 2:
@@ -270,7 +270,7 @@ scripts/examples/gn_build_example.sh examples/ota-provider-app/linux/ out chip_c
 **Run the OTA Provider application**
 
 ```
-out/chip-ota-provider-app --discriminator 22 --secured-device-port 5565 --KVS /tmp/chip_kvs_provider --filepath /tmp/test.bin
+out/chip-ota-provider-app --discriminator 22 --secured-device-port 5565 --KVS /tmp/chip_kvs_provider --filepath /tmp/ota-image.bin
 ```
 
 #### In terminal 2:
@@ -304,7 +304,7 @@ out/chip-tool pairing onnetwork-long 0x1234567890 20202021 18
 **Write to the DefaultOTAProviders attribute**
 
 ```
-out/chip-tool otasoftwareupdaterequestor write default-ota-providers '[{"fabricIndex": 1, "providerNodeID": 3735928559, "endpoint": 0}]' 0x0000001234567890 0
+out/chip-tool otasoftwareupdaterequestor write default-ota-providers '[{"providerNodeID": 3735928559, "endpoint": 0}]' 0x1234567890 0
 ```
 
 Every 60 seconds from when the OTA Requestor application has launched, the OTA
@@ -319,48 +319,108 @@ structs. Each entry in this list is a default OTA Provider per fabric. There can
 not be more than one entry containing the same fabric.
 
 To add more than one entry to the `DefaultOTAProviders` attribute, the OTA
-Requestor app must be commissioned on multiple fabrics. This can be done as
-specified below:
+Requestor app must be commissioned into multiple fabrics. At least one OTA
+Provider app should be commissioned into each corresponding fabric that the OTA
+Requestor app had been commissioned into.
 
-**Build and run the OTA Requestor application**
+The following example has two OTA Provider apps, each commissioned into a
+different fabric (alpha and beta) and one OTA Requestor app commissioned into
+both alpha and beta fabrics.
+
+### In terminal 1:
+
+**Build the OTA Provider application**
+
+```
+scripts/examples/gn_build_example.sh examples/ota-provider-app/linux/ out chip_config_network_layer_ble=false
+```
+
+**Run the first OTA Provider application**
+
+```
+out/chip-ota-provider-app --discriminator 22 --secured-device-port 5565 --KVS /tmp/chip_kvs_provider --filepath /tmp/ota-image.bin
+```
+
+### In terminal 2:
+
+**Run the second OTA Provider application**
+
+```
+out/chip-ota-provider-app --discriminator 23 --secured-device-port 5566 --KVS /tmp/chip_kvs_provider2 --filepath /tmp/ota-image2.bin
+```
+
+### In terminal 3:
+
+**Build the OTA Requestor application**
 
 ```
 scripts/examples/gn_build_example.sh examples/ota-requestor-app/linux/ out chip_config_network_layer_ble=false
-out/chip-ota-requestor-app --discriminator 18 --secured-device-port 5560 --KVS /tmp/chip_kvs_requestor --otaDownloadPath /tmp/test.bin
 ```
 
-**Commission to the first fabric**
+**Run the OTA Requestor application**
 
 ```
-out/chip-tool pairing onnetwork-long 0x1234567890 20202021 18
+out/chip-ota-requestor-app --discriminator 18 --secured-device-port 5560 --KVS /tmp/chip_kvs_requestor --periodicQueryTimeout 10
 ```
 
-**Open Basic Commissioning Window**
+### In terminal 4:
+
+**Commission the first OTA Provider into the first fabric (alpha)**
 
 ```
-out/chip-tool administratorcommissioning open-basic-commissioning-window 600 0x1234567890 0 --timedInteractionTimeoutMs 600
+out/chip-tool pairing onnetwork-long 0xC0FFEE 20202021 22
 ```
 
-**Commission to the second fabric**
+**Commission the second OTA Provider into the second fabric (beta)**
 
 ```
-out/chip-tool pairing onnetwork-long 0x858 20202021 18 --commissioner-name beta
+out/chip-tool pairing onnetwork-long 0xB0BA 20202021 23 --commissioner-name beta
 ```
 
-For all operations, specify which fabric to use by passing in
-`--commissioner-name`. The supported values are alpha, beta, and gamma. By
-default, if none is supplied, alpha is used.
+**Commission the OTA Requestor application into the first fabric (alpha)**
+
+```
+out/chip-tool pairing onnetwork-long 0xDEB 20202021 18
+```
+
+**Open Basic Commissioning Window for the OTA Requestor application**
+
+```
+out/chip-tool administratorcommissioning open-basic-commissioning-window 600 0xDEB 0 --timedInteractionTimeoutMs 600
+```
+
+**Commission the OTA Requestor application into the second fabric (beta)**
+
+```
+out/chip-tool pairing onnetwork-long 0xB0B 20202021 18 --commissioner-name beta
+```
 
-**Write/Read DefaultOTAProviders on first fabric**
+**Write/Read DefaultOTAProviders on the first fabric (alpha)**
 
 ```
-out/chip-tool otasoftwareupdaterequestor write default-ota-providers '[{"fabricIndex": 1, "providerNodeID": 3735928559, "endpoint": 0}]' 0x0000001234567890 0
-out/chip-tool otasoftwareupdaterequestor read default-ota-providers 0x1234567890 0
+out/chip-tool otasoftwareupdaterequestor write default-ota-providers '[{"providerNodeID": 12648430, "endpoint": 0}]' 0xDEB 0
+out/chip-tool otasoftwareupdaterequestor read default-ota-providers 0xDEB 0
 ```
 
-**Write/Read DefaultOTAProviders on second fabric**
+**Write/Read DefaultOTAProviders on second fabric (beta)**
 
 ```
-out/chip-tool otasoftwareupdaterequestor write default-ota-providers '[{"fabricIndex": 2, "providerNodeID": 1, "endpoint": 0}]' 0x858 0 --commissioner-name beta
-out/chip-tool otasoftwareupdaterequestor read default-ota-providers 0x858 0 --commissioner-name beta
+out/chip-tool otasoftwareupdaterequestor write default-ota-providers '[{"providerNodeID": 45242, "endpoint": 0}]' 0xB0B 0 --commissioner-name beta
+out/chip-tool otasoftwareupdaterequestor read default-ota-providers 0xB0B 0 --commissioner-name beta
 ```
+
+**Write ACL for the first OTA Provider application**
+
+```
+out/chip-tool accesscontrol write acl '[{"privilege": 5, "authMode": 2, "subjects": [112233], "targets": null}, {"privilege": 3, "authMode": 2, "subjects": null, "targets": [{"cluster": 41, "endpoint": null, "deviceType": null}]}]' 0xC0FFEE 0
+```
+
+**Write ACL for the second OTA Provider application**
+
+```
+out/chip-tool accesscontrol write acl '[{"privilege": 5, "authMode": 2, "subjects": [112233], "targets": null}, {"privilege": 3, "authMode": 2, "subjects": null, "targets": [{"cluster": 41, "endpoint": null, "deviceType": null}]}]' 0xB0BA 0 --commissioner-name beta
+```
+
+NOTE: For all operations, specify which fabric to use by passing in
+`--commissioner-name`. The supported values are alpha, beta, and gamma. By
+default, if none is supplied, alpha is used.