What the Constitution requires is not a speech to the public

It does not require a speech at all, but if a speech is given it must be a speech to the Congress to plausibly satisfy.

The Constitution requires a report to the Congress, along with an outline of measures the President would like the Congress to take.

The media are full of claims that Bozo can satisfy this requirement by addressing in his usual thuggish way a rally of his moronic supporters, to which the members of the Congress might or might not individually or collectively pay attention, ad lib.

Bozo himself will be only too glad to do that, but these claims are untrue.

He could satisfy the requirement by submitting a written document to the Congress, however, as Nancy Pelosi wrote him.

In fact, until 1913, that was the norm.

Leave it to those crazy liberals.

Article 3, Section 3

He shall from time to time give to the Congress Information of the State of the Union, and recommend to their Consideration such Measures as he shall judge necessary and expedient[.]

Wikipedia

The State of the Union Address is an annual message presented by the President of the United States to a joint session of the United States Congress at the beginning of each calendar year in office.

The message typically includes a budget message and an economic report of the nation, and also allows the President to propose a legislative agenda (for which the cooperation of Congress is needed) and national priorities.

The address fulfills rules in Article II, Section 3 of the U.S. Constitution, requiring the President to periodically "give to the Congress Information of the State of the Union, and recommend to their Consideration such measures as he shall judge necessary and expedient."

During most of the country's first century, the President primarily only submitted a written report to Congress. 

After 1913, Woodrow Wilson, the 28th U.S. President, began the regular practice of delivering the address to Congress in person as a way to rally support for the President's agenda.

With the advent of radio and television, the address is now broadcast live across the country on many networks.