Connect WalletConnect Step by Step

Although ConnectWalletConnect is convenient, it hides details of the WalletConnect Session. If you want to keep track of the wallet connect connection status, session information, connected chain ID, or connected address, you should connect WalletConnect step by step.

Get the WalletConnect Standard URI

First, we create a variable PlayCppSdkActor that references BP Play Cpp Sdk. It will be used to reference objects/instances of the Blueprint Play Cpp Sdk class, which provides WalletConnect functions.
Then, use Spawn Actor from Class to spawn from BP Play Cpp Sdk, and set the return value to variable PlayCppSdkActor for later easy access.
Call InitializeWalletConnect function from PlayCppSdkActor with the following inputs:
  • RelayServer: wallet connect 2.0 server
wss://relay.walletconnect.com
  • ProjectID: project id, can create project here, https://cloud.walletconnect.com/sign-in
  • Wallet Namespace: wallet namespace , for cronos tesetnet eip155:338
{"eip155":{"methods":["eth_sendTransaction","eth_signTransaction","eth_sign","personal_sign","eth_signTypedData"],"chains":["eip155:338"],"events":["chainChanged","accountsChanged"]}}
  • Client Meta: meta information
{"description":"Defi WalletConnect v2 example.","url":"http://localhost:8080/","icons":[],"name":"Defi WalletConnect Web3 Example"}
Drag Pin Out from function InitializeWalletConnect, search and select Add Custom Event...
Connect the Succeed result to the Condition of a node Branch
In Android, launch the WalletConnect Deep link as below:
The full blueprint demo:

Display URI using QR Code

To display QR Code in Unreal Engine, a function GenerateQrCode could be used. The return value of GenerateQrCode is Texture2D which could be displayed on a Widget or HUD, for example.
  • To show the QR Code on a Widget, select Maps, right click Content Browser > User Interface > Widget Blueprint
  • Rename the file as WBP_QR.
  • Double click WBP_QR and open the Designer editor, drag Panel > Canvas Panel to viewport to create a Canvas Panel, then drag Common > Image to the canvas (named it as Image_0), update on Details tab as: 512 (Size X) x 512 (Size Y)
  • Click Graph and switch to Event Graph
  • Right click the graph, search and select Add Custom Event..., name it as ShowQR with two inputs
    • Show: Boolean (To control the QR code show or not)
    • QR: Texture 2D (The input QR code data)
  • We could control it to show or destroy Image 0 like below
  • Compile > Save
  • Back to level blueprint editor, instead of printing the URI, we connect Output of GetConnectionString to function GenerateQrCode
  • Finally, show the QR Code by Creating WBP QR Widget, Calling Show QR function (Show should be True, QR should be the Return Value of GenerateQrCode), and Add to Viewport like so:

Get Session Status

After the QR Code is shown on the screen, we could call EnsureSessionBlocking from Play Cpp Sdk Actor to get the session status (Addresses and Chain Id) from the Out callback.
  • Create variable
    • Address, Variable Type is Wallet Connect Address
    • ChainID, Variable Type is Integer64
  • Get the first address from the Session Result Addresses and set it to Address
  • Get the Session Result Chain Id and set it to ChainID
  • Finally, destroy the QR Code (uncheck Show variable of Show QR node)

Polling

After EnsureSession, you can BeginPolling. if will check any events, and fetch if any.
  • No argument necessary
  • SetTimerByEvent to call
  • return Json Event, and result, if result is "", then no error, if result is not "", it's error state, value is error message
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OutputSourceNode=K2Node_Composite'"/Game/Tutorials/WalletConnect/BP_WalletConnect.BP_WalletConnect:EventGraph.K2Node_Composite_2"'
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End Object
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Begin Object Class=/Script/BlueprintGraph.K2Node_CallFunction Name="K2Node_CallFunction_0"
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CustomProperties Pin (PinId=A67C60024ACAD3B2D12E39938EEDE3C1,PinName="InString",PinToolTip="In String\nString\n\nThe string to log out",PinType.PinCategory="string",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=False,DefaultValue="Hello",AutogeneratedDefaultValue="Hello",LinkedTo=(K2Node_CommutativeAssociativeBinaryOperator_0 E567F92B4BBDC0AFDEDDFF92F5C1D5DD,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
CustomProperties Pin (PinId=4385C20C4C33919CD4998C9F00FD5FC8,PinName="bPrintToScreen",PinToolTip="Print to Screen\nBoolean\n\nWhether or not to print the output to the screen",PinType.PinCategory="bool",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=False,DefaultValue="true",AutogeneratedDefaultValue="true",PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=True,bOrphanedPin=False,)
CustomProperties Pin (PinId=B3981CF94AC20072657B768212E333B6,PinName="bPrintToLog",PinToolTip="Print to Log\nBoolean\n\nWhether or not to print the output to the log",PinType.PinCategory="bool",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=False,DefaultValue="true",AutogeneratedDefaultValue="true",PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=True,bOrphanedPin=False,)
CustomProperties Pin (PinId=938DD9934DA6FDD00CB1B488743D5E63,PinName="TextColor",PinToolTip="Text Color\nLinear Color Structure\n\nWhether or not to print the output to the console",PinType.PinCategory="struct",PinType.PinSubCategory="",PinType.PinSubCategoryObject=ScriptStruct'"/Script/CoreUObject.LinearColor"',PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=False,DefaultValue="(R=0.000000,G=0.000000,B=1.000000,A=1.000000)",AutogeneratedDefaultValue="(R=0.000000,G=0.660000,B=1.000000,A=1.000000)",PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=True,bOrphanedPin=False,)
CustomProperties Pin (PinId=4BAD38BE429CEF002A188D8A7160AE9B,PinName="Duration",PinToolTip="Duration\nFloat\n\nThe display duration (if Print to Screen is True). Using negative number will result in loading the duration time from the config.",PinType.PinCategory="float",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=False,DefaultValue="60.000000",AutogeneratedDefaultValue="2.000000",PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=True,bOrphanedPin=False,)
End Object
Begin Object Class=/Script/BlueprintGraph.K2Node_CommutativeAssociativeBinaryOperator Name="K2Node_CommutativeAssociativeBinaryOperator_0"
NumAdditionalInputs=2
bIsPureFunc=True
FunctionReference=(MemberParent=Class'"/Script/Engine.KismetStringLibrary"',MemberName="Concat_StrStr")
NodePosX=-688
NodePosY=-64
NodeGuid=448EDE2341834CB0DB26F88A5D297F72
CustomProperties Pin (PinId=0FD951144320FA7442EBAB9EB32CABC4,PinName="self",PinFriendlyName=NSLOCTEXT("K2Node", "Target", "Target"),PinToolTip="Target\nKismet String Library Object Reference",PinType.PinCategory="object",PinType.PinSubCategory="",PinType.PinSubCategoryObject=Class'"/Script/Engine.KismetStringLibrary"',PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=False,DefaultObject="/Script/Engine.Default__KismetStringLibrary",PersistentGuid=00000000000000000000000000000000,bHidden=True,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
CustomProperties Pin (PinId=9A4D109E45477A7E1395A0BC9F74FAE1,PinName="A",PinToolTip="A\nString\n\nThe original string",PinType.PinCategory="string",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=False,LinkedTo=(K2Node_CustomEvent_0 5F812CB5499D47A0555A4DBEF49A9197,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
CustomProperties Pin (PinId=45CD84F14FA48F906D0A1F9F2EA28CE4,PinName="B",PinToolTip="B\nString\n\nThe string to append to A",PinType.PinCategory="string",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=False,LinkedTo=(K2Node_CustomEvent_0 6CD8B6CD4C6EAC656A7A2B80E5F3046E,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
CustomProperties Pin (PinId=E567F92B4BBDC0AFDEDDFF92F5C1D5DD,PinName="ReturnValue",PinToolTip="Return Value\nString\n\nA new string which is the concatenation of A+B",Direction="EGPD_Output",PinType.PinCategory="string",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=False,LinkedTo=(K2Node_CallFunction_0 A67C60024ACAD3B2D12E39938EEDE3C1,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
CustomProperties Pin (PinId=4D5EBE5D49F57D9C65CF1AA820010CD1,PinName="C",PinToolTip="C\nString",PinType.PinCategory="string",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=False,DefaultValue=" Time=",PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
CustomProperties Pin (PinId=5041F7DF4D50390571F0D4956F6F303A,PinName="D",PinToolTip="D\nString",PinType.PinCategory="string",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=False,LinkedTo=(K2Node_CallFunction_10 BF3648F341714494D1092199985C1B38,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
End Object
Begin Object Class=/Script/BlueprintGraph.K2Node_CallFunction Name="K2Node_CallFunction_9"
bIsPureFunc=True
bIsConstFunc=True
FunctionReference=(MemberName="GetGameTimeSinceCreation",bSelfContext=True)
NodePosX=-1216
NodeGuid=9EA5B7004886A8BAEF4014AAD567EA55
CustomProperties Pin (PinId=DAB717AB4D761E0F9A6FB084AFEFF99D,PinName="self",PinFriendlyName=NSLOCTEXT("K2Node", "Target", "Target"),PinType.PinCategory="object",PinType.PinSubCategory="",PinType.PinSubCategoryObject=Class'"/Script/Engine.Actor"',PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=False,PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
CustomProperties Pin (PinId=5018040040458D262ECCAFA9347570A9,PinName="ReturnValue",Direction="EGPD_Output",PinType.PinCategory="float",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=False,DefaultValue="0.0",AutogeneratedDefaultValue="0.0",LinkedTo=(K2Node_CallFunction_10 FC9177A44054E9B328E711A0A2EA7214,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
End Object
Begin Object Class=/Script/BlueprintGraph.K2Node_CallFunction Name="K2Node_CallFunction_10"
bIsPureFunc=True
FunctionReference=(MemberParent=Class'"/Script/Engine.KismetStringLibrary"',MemberName="Conv_FloatToString")
NodePosX=-880
NodeGuid=8FF109394534188CB152FE8D93D108B8
CustomProperties Pin (PinId=DA98322C4349A4864CEF27A6ACA054B6,PinName="self",PinFriendlyName=NSLOCTEXT("K2Node", "Target", "Target"),PinToolTip="Target\nKismet String Library Object Reference",PinType.PinCategory="object",PinType.PinSubCategory="",PinType.PinSubCategoryObject=Class'"/Script/Engine.KismetStringLibrary"',PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=False,DefaultObject="/Script/Engine.Default__KismetStringLibrary",PersistentGuid=00000000000000000000000000000000,bHidden=True,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
CustomProperties Pin (PinId=FC9177A44054E9B328E711A0A2EA7214,PinName="InFloat",PinToolTip="In Float\nFloat",PinType.PinCategory="float",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=False,DefaultValue="0.0",AutogeneratedDefaultValue="0.0",LinkedTo=(K2Node_CallFunction_9 5018040040458D262ECCAFA9347570A9,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
CustomProperties Pin (PinId=BF3648F341714494D1092199985C1B38,PinName="ReturnValue",PinToolTip="Return Value\nString\n\nConverts a float value to a string",Direction="EGPD_Output",PinType.PinCategory="string",PinType.PinSubCategory="",PinType.PinSubCategoryObject=None,PinType.PinSubCategoryMemberReference=(),PinType.PinValueType=(),PinType.ContainerType=None,PinType.bIsReference=False,PinType.bIsConst=False,PinType.bIsWeakPointer=False,PinType.bIsUObjectWrapper=False,LinkedTo=(K2Node_CommutativeAssociativeBinaryOperator_0 5041F7DF4D50390571F0D4956F6F303A,),PersistentGuid=00000000000000000000000000000000,bHidden=False,bNotConnectable=False,bDefaultValueIsReadOnly=False,bDefaultValueIsIgnored=False,bAdvancedView=False,bOrphanedPin=False,)
End Object