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diff --git a/Firebase/Database/Constants/FConstants.h b/Firebase/Database/Constants/FConstants.h
new file mode 100644
index 0000000..e97a8a1
--- /dev/null
+++ b/Firebase/Database/Constants/FConstants.h
@@ -0,0 +1,190 @@
+/*
+ * Copyright 2017 Google
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef Firebase_FConstants_h
+#define Firebase_FConstants_h
+
+#import <Foundation/Foundation.h>
+
+#pragma mark -
+#pragma mark Wire Protocol Envelope Constants
+
+FOUNDATION_EXPORT NSString *const kFWPRequestType;
+FOUNDATION_EXPORT NSString *const kFWPRequestTypeData;
+FOUNDATION_EXPORT NSString *const kFWPRequestDataPayload;
+FOUNDATION_EXPORT NSString *const kFWPRequestNumber;
+FOUNDATION_EXPORT NSString *const kFWPRequestPayloadBody;
+FOUNDATION_EXPORT NSString *const kFWPRequestError;
+FOUNDATION_EXPORT NSString *const kFWPRequestAction;
+FOUNDATION_EXPORT NSString *const kFWPResponseForRNData;
+FOUNDATION_EXPORT NSString *const kFWPResponseForActionStatus;
+FOUNDATION_EXPORT NSString *const kFWPResponseForActionStatusOk;
+FOUNDATION_EXPORT NSString *const kFWPResponseForActionStatusDataStale;
+FOUNDATION_EXPORT NSString *const kFWPResponseForActionData;
+FOUNDATION_EXPORT NSString *const kFWPResponseDataWarnings;
+
+FOUNDATION_EXPORT NSString *const kFWPAsyncServerAction;
+FOUNDATION_EXPORT NSString *const kFWPAsyncServerPayloadBody;
+FOUNDATION_EXPORT NSString *const kFWPAsyncServerDataUpdate;
+FOUNDATION_EXPORT NSString *const kFWPAsyncServerDataMerge;
+FOUNDATION_EXPORT NSString *const kFWPAsyncServerDataRangeMerge;
+FOUNDATION_EXPORT NSString *const kFWPAsyncServerAuthRevoked;
+FOUNDATION_EXPORT NSString *const kFWPASyncServerListenCancelled;
+FOUNDATION_EXPORT NSString *const kFWPAsyncServerSecurityDebug;
+FOUNDATION_EXPORT NSString *const kFWPAsyncServerDataUpdateBodyPath; // {“a”: “d”, “b”: {“p”: “/”, “d”: “<data>”}}
+FOUNDATION_EXPORT NSString *const kFWPAsyncServerDataUpdateBodyData;
+FOUNDATION_EXPORT NSString *const kFWPAsyncServerDataUpdateStartPath;
+FOUNDATION_EXPORT NSString *const kFWPAsyncServerDataUpdateEndPath;
+FOUNDATION_EXPORT NSString *const kFWPAsyncServerDataUpdateRangeMerge;
+FOUNDATION_EXPORT NSString *const kFWPAsyncServerDataUpdateBodyTag;
+FOUNDATION_EXPORT NSString *const kFWPAsyncServerDataQueries;
+
+FOUNDATION_EXPORT NSString *const kFWPAsyncServerEnvelopeType;
+FOUNDATION_EXPORT NSString *const kFWPAsyncServerEnvelopeData;
+FOUNDATION_EXPORT NSString *const kFWPAsyncServerControlMessage;
+FOUNDATION_EXPORT NSString *const kFWPAsyncServerControlMessageType;
+FOUNDATION_EXPORT NSString *const kFWPAsyncServerControlMessageData;
+FOUNDATION_EXPORT NSString *const kFWPAsyncServerDataMessage;
+
+FOUNDATION_EXPORT NSString *const kFWPAsyncServerHello;
+FOUNDATION_EXPORT NSString *const kFWPAsyncServerHelloTimestamp;
+FOUNDATION_EXPORT NSString *const kFWPAsyncServerHelloVersion;
+FOUNDATION_EXPORT NSString *const kFWPAsyncServerHelloConnectedHost;
+FOUNDATION_EXPORT NSString *const kFWPAsyncServerHelloSession;
+
+FOUNDATION_EXPORT NSString *const kFWPAsyncServerControlMessageShutdown;
+FOUNDATION_EXPORT NSString *const kFWPAsyncServerControlMessageReset;
+
+#pragma mark -
+#pragma mark Wire Protocol Payload Constants
+
+FOUNDATION_EXPORT NSString *const kFWPRequestActionPut;
+FOUNDATION_EXPORT NSString *const kFWPRequestActionMerge;
+FOUNDATION_EXPORT NSString *const kFWPRequestActionTaggedListen;
+FOUNDATION_EXPORT NSString *const kFWPRequestActionTaggedUnlisten;
+FOUNDATION_EXPORT NSString *const kFWPRequestActionListen; // {"t": "d", "d": {"r": 1, "a": "l", "b": { "p": "/" } } }
+FOUNDATION_EXPORT NSString *const kFWPRequestActionUnlisten;
+FOUNDATION_EXPORT NSString *const kFWPRequestActionStats;
+FOUNDATION_EXPORT NSString *const kFWPRequestActionDisconnectPut;
+FOUNDATION_EXPORT NSString *const kFWPRequestActionDisconnectMerge;
+FOUNDATION_EXPORT NSString *const kFWPRequestActionDisconnectCancel;
+FOUNDATION_EXPORT NSString *const kFWPRequestActionAuth;
+FOUNDATION_EXPORT NSString *const kFWPRequestActionUnauth;
+FOUNDATION_EXPORT NSString *const kFWPRequestCredential;
+FOUNDATION_EXPORT NSString *const kFWPRequestPath;
+FOUNDATION_EXPORT NSString *const kFWPRequestCounters;
+FOUNDATION_EXPORT NSString *const kFWPRequestQueries;
+FOUNDATION_EXPORT NSString *const kFWPRequestTag;
+FOUNDATION_EXPORT NSString *const kFWPRequestData;
+FOUNDATION_EXPORT NSString *const kFWPRequestHash;
+FOUNDATION_EXPORT NSString *const kFWPRequestCompoundHash;
+FOUNDATION_EXPORT NSString *const kFWPRequestCompoundHashPaths;
+FOUNDATION_EXPORT NSString *const kFWPRequestCompoundHashHashes;
+FOUNDATION_EXPORT NSString *const kFWPRequestStatus;
+
+#pragma mark -
+#pragma mark Websock Transport Constants
+
+FOUNDATION_EXPORT NSString *const kWireProtocolVersionParam;
+FOUNDATION_EXPORT NSString *const kWebsocketProtocolVersion;
+FOUNDATION_EXPORT NSString *const kWebsocketServerKillPacket;
+FOUNDATION_EXPORT const int kWebsocketMaxFrameSize;
+FOUNDATION_EXPORT NSUInteger const kWebsocketKeepaliveInterval;
+FOUNDATION_EXPORT NSUInteger const kWebsocketConnectTimeout;
+
+FOUNDATION_EXPORT float const kPersistentConnReconnectMinDelay;
+FOUNDATION_EXPORT float const kPersistentConnReconnectMaxDelay;
+FOUNDATION_EXPORT float const kPersistentConnReconnectMultiplier;
+FOUNDATION_EXPORT float const kPersistentConnSuccessfulConnectionEstablishedDelay;
+
+#pragma mark -
+#pragma mark Query / QueryParams constants
+
+FOUNDATION_EXPORT NSString *const kQueryDefault;
+FOUNDATION_EXPORT NSString *const kQueryDefaultObject;
+FOUNDATION_EXPORT NSString *const kViewManagerDictConstView;
+FOUNDATION_EXPORT NSString *const kFQPIndexStartValue;
+FOUNDATION_EXPORT NSString *const kFQPIndexStartName;
+FOUNDATION_EXPORT NSString *const kFQPIndexEndValue;
+FOUNDATION_EXPORT NSString *const kFQPIndexEndName;
+FOUNDATION_EXPORT NSString *const kFQPLimit;
+FOUNDATION_EXPORT NSString *const kFQPViewFrom;
+FOUNDATION_EXPORT NSString *const kFQPViewFromLeft;
+FOUNDATION_EXPORT NSString *const kFQPViewFromRight;
+FOUNDATION_EXPORT NSString *const kFQPIndex;
+
+#pragma mark -
+#pragma mark Interrupt Reasons
+
+FOUNDATION_EXPORT NSString *const kFInterruptReasonServerKill;
+FOUNDATION_EXPORT NSString *const kFInterruptReasonWaitingForOpen;
+FOUNDATION_EXPORT NSString *const kFInterruptReasonRepoInterrupt;
+FOUNDATION_EXPORT NSString *const kFInterruptReasonAuthExpired;
+
+#pragma mark -
+#pragma mark Payload constants
+
+FOUNDATION_EXPORT NSString *const kPayloadPriority;
+FOUNDATION_EXPORT NSString *const kPayloadValue;
+FOUNDATION_EXPORT NSString *const kPayloadMetadataPrefix;
+
+#pragma mark -
+#pragma mark ServerValue constants
+
+FOUNDATION_EXPORT NSString *const kServerValueSubKey;
+FOUNDATION_EXPORT NSString *const kServerValuePriority;
+
+#pragma mark -
+#pragma mark .info/ constants
+
+FOUNDATION_EXPORT NSString *const kDotInfoPrefix;
+FOUNDATION_EXPORT NSString *const kDotInfoConnected;
+FOUNDATION_EXPORT NSString *const kDotInfoServerTimeOffset;
+
+#pragma mark -
+#pragma mark ObjectiveC to JavaScript type constants
+
+FOUNDATION_EXPORT NSString *const kJavaScriptObject;
+FOUNDATION_EXPORT NSString *const kJavaScriptString;
+FOUNDATION_EXPORT NSString *const kJavaScriptBoolean;
+FOUNDATION_EXPORT NSString *const kJavaScriptNumber;
+FOUNDATION_EXPORT NSString *const kJavaScriptNull;
+FOUNDATION_EXPORT NSString *const kJavaScriptTrue;
+FOUNDATION_EXPORT NSString *const kJavaScriptFalse;
+
+#pragma mark -
+#pragma mark Error handling constants
+
+FOUNDATION_EXPORT NSString *const kFErrorDomain;
+FOUNDATION_EXPORT NSUInteger const kFAuthError;
+FOUNDATION_EXPORT NSString *const kFErrorWriteCanceled;
+
+#pragma mark -
+#pragma mark Validation Constants
+
+FOUNDATION_EXPORT NSUInteger const kFirebaseMaxObjectDepth;
+FOUNDATION_EXPORT const unsigned int kFirebaseMaxLeafSize;
+
+#pragma mark -
+#pragma mark Transaction Constants
+
+FOUNDATION_EXPORT NSUInteger const kFTransactionMaxRetries;
+FOUNDATION_EXPORT NSString *const kFTransactionTooManyRetries;
+FOUNDATION_EXPORT NSString *const kFTransactionNoData;
+FOUNDATION_EXPORT NSString *const kFTransactionSet;
+FOUNDATION_EXPORT NSString *const kFTransactionDisconnect;
+
+#endif
diff --git a/Firebase/Database/Constants/FConstants.m b/Firebase/Database/Constants/FConstants.m
new file mode 100644
index 0000000..e492ba1
--- /dev/null
+++ b/Firebase/Database/Constants/FConstants.m
@@ -0,0 +1,183 @@
+/*
+ * Copyright 2017 Google
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import "FConstants.h"
+
+#pragma mark -
+#pragma mark Wire Protocol Envelope Constants
+
+NSString *const kFWPRequestType = @"t";
+NSString *const kFWPRequestTypeData = @"d";
+NSString *const kFWPRequestDataPayload = @"d";
+NSString *const kFWPRequestNumber  = @"r";
+NSString *const kFWPRequestPayloadBody = @"b";
+NSString *const kFWPRequestError = @"error";
+NSString *const kFWPRequestAction = @"a";
+NSString *const kFWPResponseForRNData = @"b";
+NSString *const kFWPResponseForActionStatus = @"s";
+NSString *const kFWPResponseForActionStatusOk = @"ok";
+NSString *const kFWPResponseForActionStatusDataStale = @"datastale";
+NSString *const kFWPResponseForActionData = @"d";
+NSString *const kFWPResponseDataWarnings = @"w";
+NSString *const kFWPAsyncServerAction = @"a";
+NSString *const kFWPAsyncServerPayloadBody = @"b";
+NSString *const kFWPAsyncServerDataUpdate = @"d";
+NSString *const kFWPAsyncServerDataMerge = @"m";
+NSString *const kFWPAsyncServerDataRangeMerge = @"rm";
+NSString *const kFWPAsyncServerAuthRevoked = @"ac";
+NSString *const kFWPASyncServerListenCancelled = @"c";
+NSString *const kFWPAsyncServerSecurityDebug = @"sd";
+NSString *const kFWPAsyncServerDataUpdateBodyPath = @"p"; // {“a”: “d”, “b”: {“p”: “/”, “d”: “<data>”}}
+NSString *const kFWPAsyncServerDataUpdateBodyData = @"d";
+NSString *const kFWPAsyncServerDataUpdateStartPath = @"s";
+NSString *const kFWPAsyncServerDataUpdateEndPath = @"e";
+NSString *const kFWPAsyncServerDataUpdateRangeMerge = @"m";
+NSString *const kFWPAsyncServerDataUpdateBodyTag = @"t";
+NSString *const kFWPAsyncServerDataQueries = @"q";
+
+NSString *const kFWPAsyncServerEnvelopeType = @"t";
+NSString *const kFWPAsyncServerEnvelopeData = @"d";
+NSString *const kFWPAsyncServerControlMessage = @"c";
+NSString *const kFWPAsyncServerControlMessageType = @"t";
+NSString *const kFWPAsyncServerControlMessageData = @"d";
+NSString *const kFWPAsyncServerDataMessage = @"d";
+
+NSString *const kFWPAsyncServerHello = @"h";
+NSString *const kFWPAsyncServerHelloTimestamp = @"ts";
+NSString *const kFWPAsyncServerHelloVersion = @"v";
+NSString *const kFWPAsyncServerHelloConnectedHost = @"h";
+NSString *const kFWPAsyncServerHelloSession = @"s";
+
+NSString *const kFWPAsyncServerControlMessageShutdown = @"s";
+NSString *const kFWPAsyncServerControlMessageReset = @"r";
+
+#pragma mark -
+#pragma mark Wire Protocol Payload Constants
+
+NSString *const kFWPRequestActionPut = @"p";
+NSString *const kFWPRequestActionMerge = @"m";
+NSString *const kFWPRequestActionListen = @"l"; // {"t": "d", "d": {"r": 1, "a": "l", "b": { "p": "/" } } }
+NSString *const kFWPRequestActionUnlisten = @"u";
+NSString *const kFWPRequestActionStats = @"s";
+NSString *const kFWPRequestActionTaggedListen = @"q";
+NSString *const kFWPRequestActionTaggedUnlisten = @"n";
+NSString *const kFWPRequestActionDisconnectPut = @"o";
+NSString *const kFWPRequestActionDisconnectMerge = @"om";
+NSString *const kFWPRequestActionDisconnectCancel = @"oc";
+NSString *const kFWPRequestActionAuth = @"auth";
+NSString *const kFWPRequestActionUnauth = @"unauth";
+NSString *const kFWPRequestCredential = @"cred";
+NSString *const kFWPRequestPath = @"p";
+NSString *const kFWPRequestCounters = @"c";
+NSString *const kFWPRequestQueries = @"q";
+NSString *const kFWPRequestTag = @"t";
+NSString *const kFWPRequestData = @"d";
+NSString *const kFWPRequestHash = @"h";
+NSString *const kFWPRequestCompoundHash = @"ch";
+NSString *const kFWPRequestCompoundHashPaths = @"ps";
+NSString *const kFWPRequestCompoundHashHashes = @"hs";
+NSString *const kFWPRequestStatus = @"s";
+
+#pragma mark -
+#pragma mark Websock Transport Constants
+
+NSString *const kWireProtocolVersionParam = @"v";
+NSString *const kWebsocketProtocolVersion = @"5";
+NSString *const kWebsocketServerKillPacket = @"kill";
+const int kWebsocketMaxFrameSize = 16384;
+NSUInteger const kWebsocketKeepaliveInterval = 45;
+NSUInteger const kWebsocketConnectTimeout = 30;
+
+float const kPersistentConnReconnectMinDelay = 1.0;
+float const kPersistentConnReconnectMaxDelay = 30.0;
+float const kPersistentConnReconnectMultiplier = 1.3f;
+float const kPersistentConnSuccessfulConnectionEstablishedDelay = 30.0;
+
+#pragma mark -
+#pragma mark Query constants
+
+NSString *const kQueryDefault = @"default";
+NSString *const kQueryDefaultObject = @"{}";
+NSString *const kViewManagerDictConstView = @"view";
+NSString *const kFQPIndexStartValue = @"sp";
+NSString *const kFQPIndexStartName = @"sn";
+NSString *const kFQPIndexEndValue = @"ep";
+NSString *const kFQPIndexEndName = @"en";
+NSString *const kFQPLimit = @"l";
+NSString *const kFQPViewFrom = @"vf";
+NSString *const kFQPViewFromLeft = @"l";
+NSString *const kFQPViewFromRight = @"r";
+NSString *const kFQPIndex = @"i";
+
+#pragma mark -
+#pragma mark Interrupt Reasons
+
+NSString *const kFInterruptReasonServerKill = @"server_kill";
+NSString *const kFInterruptReasonWaitingForOpen = @"waiting_for_open";
+NSString *const kFInterruptReasonRepoInterrupt = @"repo_interrupt";
+
+#pragma mark -
+#pragma mark Payload constants
+
+NSString *const kPayloadPriority = @".priority";
+NSString *const kPayloadValue = @".value";
+NSString *const kPayloadMetadataPrefix = @".";
+
+#pragma mark -
+#pragma mark ServerValue constants
+
+NSString *const kServerValueSubKey = @".sv";
+NSString *const kServerValuePriority = @"timestamp";
+
+#pragma mark -
+#pragma mark .info/ constants
+
+NSString *const kDotInfoPrefix = @".info";
+NSString *const kDotInfoConnected = @"connected";
+NSString *const kDotInfoServerTimeOffset = @"serverTimeOffset";
+
+#pragma mark -
+#pragma mark ObjectiveC to JavaScript type constants
+
+NSString *const kJavaScriptObject = @"object";
+NSString *const kJavaScriptString = @"string";
+NSString *const kJavaScriptBoolean = @"boolean";
+NSString *const kJavaScriptNumber = @"number";
+NSString *const kJavaScriptNull = @"null";
+NSString *const kJavaScriptTrue = @"true";
+NSString *const kJavaScriptFalse = @"false";
+
+#pragma mark -
+#pragma mark Error handling constants
+
+NSString *const kFErrorDomain = @"com.firebase";
+NSUInteger const kFAuthError = 1;
+NSString *const kFErrorWriteCanceled = @"write_canceled";
+
+#pragma mark -
+#pragma mark Validation Constants
+
+NSUInteger const kFirebaseMaxObjectDepth = 1000;
+const unsigned int kFirebaseMaxLeafSize = 1024 * 1024 * 10; // 10 MB
+
+#pragma mark -
+#pragma mark Transaction Constants
+
+NSUInteger const kFTransactionMaxRetries = 25;
+NSString *const kFTransactionTooManyRetries = @"maxretry";
+NSString *const kFTransactionNoData = @"nodata";
+NSString *const kFTransactionSet = @"set";
+NSString *const kFTransactionDisconnect = @"disconnect";