first try at posting messages into a room

controllers/matrix_chat.php

@@ -51,8 +51,14 @@ class MatrixChatController extends AuthenticatedController
                 $this->hasToCreate = false;
 
                 $room->requireMembership($this->account->getLinkedAccount());
+
+                $room->sendMessage(
+                    'Avengers... assemble.',
+                    '<!-- HTML -->Hulk <strong>SMASH</strong>!'
+                );
             }
         }
+
     }
 
     public function require_room_action()

models/MatrixRoom.php

@@ -158,4 +158,27 @@ class MatrixRoom extends SimpleORMap
         }
     }
 
+    /**
+     * Sends a message into the current room, sender is the Stud.IP system account.
+     *
+     * @param string $title
+     * @param string $body
+     */
+    public function sendMessage($title, $body)
+    {
+        $content = [
+            'msgtype' => 'm.text',
+            'format' => 'm.format.custom_html',
+            'body' => strip_tags($title . ":\n" . $body),
+            'formatted_body' => htmlReady('<strong>' . $title . '</strong><br>' . $body),
+        ];
+        MatrixClient::get()->sendRoomEvent(
+            MatrixAccount::requireSystemAccount(),
+            $this->getLinkedRoom(),
+            'm.room.message',
+            '',
+            $content
+        );
+    }
+
 }
\ No newline at end of file