Note that documentation for random_max_start_delay config setting has
been changed to indicate that the setting is in seconds, and always has
been. No functional change.
When AT traces are enabled and very long AT commands are traced,
system can easily go to unwanted state. Therefore the length of the AT
traces is limited to DEBUG_MAXLEN (currently 60 characters).
This commit fixes read_hex_string, read_bytes and write to use this
limitter.
According to [3GPP-TS_24.008] the maximum size for Non-IP link MTU is 1358 octets to prevent fragmentation in the backbone network.
Therefore reduced the maximum size to follow the standard.
A new API `CellularDevice::clear()` to clean-up the modem to a default initial state.
Function is virtual so it can be overridden. The default implementation clears all PDP contexts,
but the the first one if that has APN defined as `nsapi.default-cellular-apn`.
CellularStateMachine calls `clear()` to clean-up the modem on initial `connect()`,
if the flag `cellular.clear-on-connect: true` is defined.