Merge "NanoAppMessage: Optimize toString()" into main

    public String toString() {

        int length = mMessageBody.length;

        String ret = "NanoAppMessage[type = " + mMessageType + ", length = " + mMessageBody.length

                + " bytes, " + (mIsBroadcasted ? "broadcast" : "unicast") + ", nanoapp = 0x"

                + Long.toHexString(mNanoAppId) + ", isReliable = "

                + (mIsReliable ? "true" : "false") + ", messageSequenceNumber = "

                + mMessageSequenceNumber + "](";

        StringBuilder out = new StringBuilder();

        out.append( "NanoAppMessage[type = ");

        out.append(mMessageType);

        out.append(", length = ");

        out.append(mMessageBody.length);

        out.append(" bytes, ");

        out.append(mIsBroadcasted ? "broadcast" : "unicast");

        out.append(", nanoapp = 0x");

        out.append(Long.toHexString(mNanoAppId));

        out.append(", isReliable = ");

        out.append(mIsReliable ? "true" : "false");

        out.append(", messageSequenceNumber = ");

        out.append(mMessageSequenceNumber);

        out.append("](");

        if (length > 0) {

            ret += "data = 0x";

            out.append("data = 0x");

        }

        for (int i = 0; i < Math.min(length, DEBUG_LOG_NUM_BYTES); i++) {

            ret += HexEncoding.encodeToString(mMessageBody[i], true /* upperCase */);

            out.append(HexEncoding.encodeToString(mMessageBody[i],

                                                  true /* upperCase */));

            if ((i + 1) % 4 == 0) {

                ret += " ";

                out.append(" ");

            }

        }

        if (length > DEBUG_LOG_NUM_BYTES) {

            ret += "...";

            out.append("...");

        }

        ret += ")";

        out.append(")");

        return ret;

        return out.toString();

    }

    @Override