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header image Before proceeding setup a basic expo project. Or you can follow me to setup a production-ready Boilerplate project by Infinite Red Team. 
npx ignite-cli@latest new solana-mwa-starter
This Boilerplate code will provide you with a predefined project structure with standard packages already configured. Let us just leverage the existing setup and ignore the rest as they are not relevant to our tutorial.

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What is Mobile Wallet Adapter?

Well, It is a protocol that allows mobile apps to connect to solana wallets that implement the MWA protocol. In simple terms you can interact with wallets that support MWA specification from your mobile app and perform actions like signing transactions & messages, SIWS …

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How are we going to do it?

  1. We will use a solana js SDK called kit to create generic hooks that can accept transactions & messages and make it interact with mobile wallets.
  2. On top of these, we’ll build signers to simplify working with Kit SDK, similar to how you would with generateKeyPairSigner.

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Setup Kit Client

Install kit package 
npm install @solana/kit
Now, let’s create a folder in services dir called kit and create a file called client.tsx inside it and add the following code
services/kit/client.tsx

import { Rpc, RpcSubscriptions, SolanaRpcApi, SolanaRpcSubscriptionsApi, createSolanaRpc, createSolanaRpcSubscriptions } from '@solana/kit';
import { createContext, useContext, useMemo, ReactNode } from 'react';

export type Client = {
    rpc: Rpc<SolanaRpcApi>;
    rpcSubscriptions: RpcSubscriptions<SolanaRpcSubscriptionsApi>;
};

export interface ClientContextValue {
    rpc: Rpc<SolanaRpcApi>
    rpcSubscriptions: RpcSubscriptions<SolanaRpcSubscriptionsApi>
}

export interface KitClientProviderProps {
    children: ReactNode;
    rpcEndpoint?: string;
    wsEndpoint?: string;
}

const KitClientContext = createContext<ClientContextValue | undefined>(undefined);

function createClient(rpcEndpoint = 'http://127.0.0.1:8899', wsEndpoint = 'ws://127.0.0.1:8900'): Client {
    return {
        rpc: createSolanaRpc(rpcEndpoint),
        rpcSubscriptions: createSolanaRpcSubscriptions(wsEndpoint),
    };
}

export function KitClientProvider({ 
    children, 
    rpcEndpoint = 'https://devnet.helius-rpc.com', 
    wsEndpoint = 'wss://devnet.helius-rpc.com' 
}: KitClientProviderProps) {
    const client = useMemo(() => createClient(rpcEndpoint, wsEndpoint), [rpcEndpoint, wsEndpoint]);
    
    const contextValue = useMemo(() => ({
        rpc: client.rpc,
        rpcSubscriptions: client.rpcSubscriptions,
    }), [client]);

    return (
        <KitClientContext.Provider value={contextValue}>
            {children}
        </KitClientContext.Provider>
    );
}

export function useKitClient(): ClientContextValue {
    const context = useContext(KitClientContext);
    if (!context) {
        throw new Error('useKitClient must be used within a KitClientProvider');
    }
    return context;
}
All we are doing here is creating RPC and RPC subscriptions objects and using context provider to reuse them throughout our application. Actually we wont be needing rpc subscriptions object, but I just added it to make the code look similar to the official kit docs. Now go to root file (in my case its _Layout.tsx) and wrap your app with KitClientProvider
app/_layout.tsx
import { KitClientProvider } from "@/services/kit/client"

///

export default function Root() {

    /// 

    return (
    <SafeAreaProvider initialMetrics={initialWindowMetrics}>
        <KitClientProvider>
          <ThemeProvider>
            <KeyboardProvider>
              <GestureHandlerRootView>
                <Slot />
                <Toaster position="top-center" richColors={true} />
              </GestureHandlerRootView>
            </KeyboardProvider>
          </ThemeProvider>
        </KitClientProvider>
    </SafeAreaProvider>
  )
}
If you have any hard time following the steps or fell that my grammar is not good enough, you can always refer to the complete code github repo

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Install Mobile Wallet Adapter

Install @solana-mobile/mobile-wallet-adapter-protocol, this is the core package that provides the MWA protocol implementation with react native 
npm install @solana-mobile/mobile-wallet-adapter-protocol
Next, Install the wrapper of MWA for Kit SDK called @solana-mobile/mobile-wallet-adapter-kit. This package provides us typed utilities making it easier to work with MWA and Kit SDK. 
npm install @solana-mobile/mobile-wallet-adapter-kit