Detailed description

When trying to send a message, using the MatrixHttpApi directly like this...

$matrix = new MatrixHttpApi("https://matrix.org", "mySecretAccessToken");
$matrix->sendMessage("!aBcDeFgHiJkLmNoP:matrix.org", "TEST");

... i get this Exception:

MatrixPhp\Exceptions\MatrixRequestException: {"errcode":"M_FORBIDDEN","error":"User @myUsername:matrix.org not in room 0"} in MatrixPhp\MatrixHttpApi->send() (Line 971 in ../vendor/meet-kinksters/php-matrix-sdk/src/MatrixHttpApi.php).

Context

I think i already found the reason for this:

This bug was introduced in this commit: a2f2ede#diff-38b93873fb3c16b88d76ea19944d82e9690d16322838a0f3fbd18051a3aae87dR353

In the sprintf function, the specifier for the room id was changed from %s (string) to %u (unsigned decimal number).

This is not fitting for the room id which is in format !aBcDeFgHiJkLmNoP:matrix.org.

Possible implementation

Change back from %u to %s