Getting error "Unable to find a matching set of capabilities" when I try to launch safari browser on iPhone.

For issues

We have recently started automating iPhone safari with robot framework selenium. Sometimes we get "Unable to find a matching set of capabilities" when we try to run iPhone safari. I searched online but could not find any issue like this. I feel there is some capabilities I am missing but similar capabilities is working when I used python language binding. Please help.

Steps to reproduce the issue

${capabilities}= Evaluate sys.modules['selenium.webdriver'].DesiredCapabilities.SAFARI sys, selenium.webdriver

Set To Dictionary ${capabilities} platformName=ios
Set to Dictionary ${capabilities} browserName=safari
Log To Console ${capabilities}

Open Browser url=https://www.google.com desired_capabilities=${capabilities} remote_url=http://localhost:4449/wd/hub

Error messages and additional information

Robot Framework logs:
SessionNotCreatedException: Message: Unable to find a matching set of capabilities
Build info: version: '3.141.59', revision: 'e82be7d358', time: '2018-11-14T08:25:53'
System info: host: 'P84445', ip: 'fe80:0:0:0:1832:dbdf:a8c:c83b%en0', os.name: 'Mac OS X', os.arch: 'x86_64', os.version: '12.4', java.version: '11.0.15'
Driver info: driver.version: unknown
remote stacktrace:
Stacktrace:
at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0 (NativeConstructorAccessorImpl.java:-2)
at jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance (NativeConstructorAccessorImpl.java:62)
at jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance (DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance (Constructor.java:490)
at org.openqa.selenium.remote.W3CHandshakeResponse.lambda$errorHandler$0 (W3CHandshakeResponse.java:62)
at org.openqa.selenium.remote.HandshakeResponse.lambda$getResponseFunction$0 (HandshakeResponse.java:30)
[ Message content over the limit has been removed. ]
at java.util.stream.AbstractPipeline.wrapAndCopyInto (AbstractPipeline.java:474)
at java.util.stream.FindOps$FindOp.evaluateSequential (FindOps.java:150)
at java.util.stream.AbstractPipeline.evaluate (AbstractPipeline.java:234)
at java.util.stream.ReferencePipeline.findFirst (ReferencePipeline.java:543)
at org.openqa.selenium.remote.server.NewSessionPipeline.createNewSession (NewSessionPipeline.java:72)
at org.openqa.selenium.remote.server.commandhandler.BeginSession.execute (BeginSession.java:65)
at org.openqa.selenium.remote.server.WebDriverServlet.lambda$handle$0 (WebDriverServlet.java:235)
at java.util.concurrent.Executors$RunnableAdapter.call (Executors.java:515)
at java.util.concurrent.FutureTask.run (FutureTask.java:264)
at java.util.concurrent.ThreadPoolExecutor.runWorker (ThreadPoolExecutor.java:1128)
at java.util.concurrent.ThreadPoolExecutor$Worker.run (ThreadPoolExecutor.java:628)
at java.lang.Thread.run (Thread.java:829)

Selenium Grid logs:
17:33:12.151 DEBUG [WebDriverServlet.handle] - Found handler: org.openqa.selenium.remote.server.commandhandler.BeginSession@64a951bc
17:33:12.155 DEBUG [WebDriverServlet.lambda$handle$0] - /session: Executing POST on /session (handler: BeginSession)
17:33:12.205 INFO [ActiveSessionFactory.apply] - Capabilities are: {
"browserName": "safari",
"moz:firefoxOptions": {
"profile": "UEsDBBQAAAAIACaM3VTrmRmacgMAAJoMAAAHAAAAdXNlci5qc6VWTW\u002fUMBC98ytQTyCx1rbABU6lFAkJUcSq4mg59mTjrmMbe7zp\u002fnvGyaYsbb6AWz7e89hvZt44RQjcByhfnBXBNfTGlKtZo61yDVOp9gysKAyos1fPMSR4+f5ZesoxAiGEZE\u002fApTBxBG2hQVGwFAzhzkThEr4rjLC7sym8F1tYtn5EETB5lhmEXE+jKlfDEblgL49Z3O3p5FoBqyM6266it9YFGFmAPqkb+6MVOJ6vmbYY3O33L9Phc1Jqcc9lFSgwjzJoj5wU56jrHPT1epiwDBnAu4BcGMPvIod7CR61s3Ew6XdiL7plmetgLFau+Wyv6NEZGCRZwMaFHZOCKHtY5XjCrAiw13ImrxFkChoPTMa+HEeAj5PTgJFZr9lSm2IyoZTO5xQzizRQqECHC1zIrCBPlNsUERSXEHBYzRNSjClHfCBp+gBhkCW8Z8krajsmErphOU5Ai\u002fpG6eiNOIC6Pl9vvjqkxBDhzQjYNdY4oajKLAkW2hr4UYHdZCm13U7Hur79csn63pn0lhb5mnWSzvmQtjsqSrBUw+RIXcYu5rDkL53hjYNdWRJ+pOx6UAChsjKAIGmnn3SIeElayJGeePAUUUL7TKotdLhTRi1MI8JSbwQRZHUsizmoKWPyuVN7rx4zRYgx+wCS7ZEKbRmXZFRcBhGrmSgVGMNkBXL3EUqRDH7o\u002fkzTaCBERse2N\u002fbKuDhzlBP0DWV8GEyKiM4Is6oVCINV984W2dQEP\u002fncKtf\u002fyO6jl7mgvqe\u002f375x223+KDuD\u002fot9eGe0PLD8cZOKWrd5\u002fl\u002f+t\u002fbj5e+GHloG9uiciYwcwoXjxifvInmOkYNlAG\u002fbWtHQsFuelR+OkT3CtoXbmujHjryRxM5efb4ehRfGyZ3REacr4oTRFviVq71AXWiTp5nV2wrNYZa6xMKfwi35d3m4HW2kkyk+pWo\u002ftzuXXx19cEXzElMcXrmnVIh0B6t0rA6r\u002fNvTgFsZsFvMlnDx9u2ftH5pmlqUD2Ncw4sDV50nDO7Nk8V4jLm7ee2UMAuvEaU2QE\u002fMBU1twbsazTejGXzEoCXyx7ShUPkKaMkKa6gLCJv2dUSuXOY7jewoWz9Oj6U8ePCegmAoAoYD66RoT34xh50U6Sk8wF07zgZ3cu812T5li+UjU02Q+xPjZ9JhLMJvSlNpCpO7aIDxC1BLAQIUAxQAAAAIACaM3VTrmRmacgMAAJoMAAAHAAAAAAAAAAAAAACkgQAAAAB1c2VyLmpzUEsFBgAAAAABAAEANQAAAJcDAAAAAA=="
},
"platformName": "ios"
}
17:33:12.207 INFO [ActiveSessionFactory.lambda$apply$11] - Matched factory org.openqa.selenium.grid.session.remote.ServicedSession$Factory (provider: org.openqa.selenium.firefox.GeckoDriverService)
1656491592225 geckodriver INFO Listening on 127.0.0.1:7741

Expected behavior and actual behavior

When I try to run open browser for safari iphone no matter what I do I am not able to launch the browser.

I can run the similar code when I use python binding with same capabilities.

`
from selenium import webdriver

caps = {'browserName': 'safari', 'platformName': 'ios'}
driver = webdriver.Remote('http://localhost:4449/wd/hub', desired_capabilities=caps)
driver.get('http://www.google.com')
`

Environment

Browser: iOS Version 14.6
Browser driver: Safari 15.5 (17613.2.7.1.8)
Operating System: Mac

Libraries

• Robot Framework: 5.0.1
• Selenium: 4.3.0
• SeleniumLibrary: 6.0.0
• Interpreter: pipenv
• Selenium Grid: 3.141.59

Start by comparing the Robot Framework capabilities shown in the issue with the Python binding example, then read the Selenium Grid session and matching-factory logs. Done means identifying a reproducible capability or configuration change that allows the iOS Safari session to launch through the reported remote URL.