IM

RTCEngineError errorCode = [[RTCEngineKit sharedEngine] enableImWithToken:@"Your Token" delegate:self];
if (errorCode != RTCEngineErrorOK) {
    NSLog(@"Failed to establish the IM connection");
}

@interface YourClass : NSObject <RTCEngineIMDelegate>
/// Add any of the following callbacks here as needed.

/// Connected callback
/// You receive this event after calling enableImWithToken:() to enable IM; errors are reported through the onImDisconnected:() event.
/// - Parameters:
///   - userId: user ID
///   - sessionId: session ID
- (void)onImConnectSucceed:(NSString *)userId sessionId:(NSString *)sessionId {
    
    NSLog(@"IM connection established userId = %@, sessionId = %@", userId, sessionId);
}

/// Reconnecting callback
/// This event means the connection has a problem, such as a network error, and the SDK is trying to reconnect.
- (void)onImReconnecting {
    
    NSLog(@"IM connection lost, the SDK is trying to reconnect.");
}

/// Reconnected callback
/// You receive this event when the connection is restored.
- (void)onImReconnected {
    
    NSLog(@"IM connection restored.");
}

/// Disconnected callback
/// Triggered by an unrecoverable error or an involuntary disconnect; if it's an error, you need to get a new token
/// @param reason leave reason
/// @param errCode error code
/// @param errMsg error message
- (void)onImDisconnected:(RTCImDisconnectReason)reason errCode:(RTCEngineError)errCode errMsg:(nullable NSString *)errMsg {
    
    NSLog(@"IM connection error or passive disconnect, please reconnect reason = %ld, errCode = %ld, errMsg = %@", reason, errCode, errMsg);
}

/// Message received callback
/// After a message is sent through the backend API, the specified users receive this event.
/// @param content message content
/// @param action message action
/// @param userId user ID
/// @param sessionId session ID
/// @param nickname user nickname
- (void)onImMessage:(NSString *)content action:(NSString *)action userId:(nullable NSString *)userId sessionId:(nullable NSString *)sessionId nickname:(nullable NSString *)nickname {
    
    NSLog(@"IM message received action = %@ content = %@ userId = %@", action, content, userId);
}

[[RTCEngineKit sharedEngine] disableIm];

[[RTCEngineKit sharedEngine] destroy];