diff options
| -rw-r--r-- | src/bus.py | 8 |
1 files changed, 7 insertions, 1 deletions
@@ -148,7 +148,7 @@ class Bus: @param callback Function to call when a message is received, the input parameters will be the read message and - `user_data` from the function's [Bus.read] parameter + `user_data` from the function's [`Bus.read`] parameter with the same name. The message must have been parsed or copied when `callback` returns as it may be over overridden after that time. `callback` should @@ -156,6 +156,12 @@ class Bus: 0: stop listening 1: continue listening -1: an error has occurred + However, the function [`Bus.read`] will invoke + `callback` with `message` set to `None` one time + directly after it has started listening on the bus. + This is to the the program now it can safely continue + with any action that requires that the programs is + listening on the bus. NB! The received message will not be decoded from UTF-8 @param user_data See description of `callback` ''' |