Traceback (most recent call last):
  File "src/gevent/greenlet.py", line 716, in gevent._greenlet.Greenlet.run
  File "site-packages/raiden/network/transport/matrix.py", line 262, in _run
  File "site-packages/raiden/network/transport/matrix.py", line 253, in _check_and_send
  File "site-packages/raiden/network/transport/matrix.py", line 1028, in _send_raw
  File "site-packages/matrix_client/room.py", line 105, in send_text
  File "site-packages/matrix_client/api.py", line 336, in send_message
  File "site-packages/matrix_client/api.py", line 256, in send_message_event
  File "site-packages/raiden_libs/network/matrix/client.py", line 75, in _send
  File "site-packages/matrix_client/api.py", line 691, in _send
matrix_client.errors.MatrixRequestError: 413: {"errcode":"M_TOO_LARGE","error":"event too large"}
2018-12-19T14:08:39Z <Greenlet "RetryQueue:4d6fa60e" at 0x7f34604d0448: <bound method _RetryQueue._run of <_RetryQueue for 0x4d6fa60e64c7e520899a9aedd40cb1e6992027f0>>> failed with MatrixRequestError