How can I collect logs from client side devices like mobile or tablet devices?

You can POST logs (text files or .gzip files) directly to Sumo Logic HTTP Source (endpoint).

Some best practices/tips to consider are:

Logging Appenders:

Best practices:

It's best to build mobile logging asynchronously so that the app 'fires and forgets' about the log and doesn't freeze/interrupt the app
Hardcoding the Sumo endpoint into the logging framework is not advised (someone could delete it).
Performance-wise it's advised to send the logs to a queue so that data can be buffered, packaged, compressed and the data forwarding from there to Sumo can be decoupled from the logging code
Another consideration is whether or not the device has data/internet, or if the mobile app has offline capabilities