Authentic collaborative m-learning activities were designed, developed and implemented for a computer networking course. The effect of the activities on student engagement and motivation were analyzed using a mixed method research design. Moreover, the effect of the iterative design of the content and instructional process of authentic m-learning activities on students' engagement and motivation were analyzed in the study. The activities were implemented for two consecutive semesters and were modified based on the findings from the first semester. Student engagement survey and motivation questionnaire were used to collect quantitative data, student interview protocol was used to collect qualitative data for further investigation. The findings from the first semester indicated that the engagement categories "personal development" and "satisfaction from the course" had the highest mean scores. In the second semester, the highest mean score belonged to the "personal development" category, followed by "collaborative learning." Comparison of the results from two semesters revealed that the improvements in the content of the activities and instructional process increased the "collaboration" among students as well as their "interaction with instructor." Paired sample t-tests revealed a difference in indicators of student motivation within groups in both semesters. Analysis of the interview data showed that students perceived the authentic activities as an appropriate tool for enhancement in "communication" and "collaboration" opportunities.