Displaying new messages on Mission Planner

Thanks, I've tried but have had trouble getting my message to send, particularly on step 5 of the guide. My understanding of the "hierarchy" of the code to send a message is this: to send a message, we use the send_message function, which in turn calls the try_send_message function, which has a bunch of switch-case statements, and within each of those statements is (usually) to send a specific kind of data. So, for example, sending pressure uses the send_scaled_pressure function. My job, then, (if I'm understanding this correctly) is to add the new case statement and add a new function to send that message. My questions are as follows:

1. How do I know this is displayed on Mission Planner? I.e. how is this necessarily printed on the "Status" screen? It doesn't seem like using the GCS_MavLink protocol ensures that the message is then communicated to Mission Planner, and I can't find where in the Mission Planner code they get the MavLink messages from (granted, I'm having trouble with the Mission Planner code as is).

2. What's the point of the gcs_send_heartbeat or gcs_data_stream_send functions? We already have send_heartbeat and data_stream_send functions, so I don't understand what those do.

I'm new with this code, so forgive me if my questions were answered elsewhere. I've looked through that guide and the Mavlink Guide for Dummies, as well as a few forum posts, extensively and have yet to find satisfactory answers.

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Developer

Craig Elder June 24, 2015 at 8:37am

You might want to try reading the wiki

http://dev.ardupilot.com/wiki/apmcopter-code-overview/code-overview...

there is a wealth of information available
- Grisam Shah > Craig Elder June 24, 2015 at 8:47am
  
  Thanks, I've tried but have had trouble getting my message to send, particularly on step 5 of the guide. My understanding of the "hierarchy" of the code to send a message is this: to send a message, we use the send_message function, which in turn calls the try_send_message function, which has a bunch of switch-case statements, and within each of those statements is (usually) to send a specific kind of data. So, for example, sending pressure uses the send_scaled_pressure function. My job, then, (if I'm understanding this correctly) is to add the new case statement and add a new function to send that message. My questions are as follows:
  
  1. How do I know this is displayed on Mission Planner? I.e. how is this necessarily printed on the "Status" screen? It doesn't seem like using the GCS_MavLink protocol ensures that the message is then communicated to Mission Planner, and I can't find where in the Mission Planner code they get the MavLink messages from (granted, I'm having trouble with the Mission Planner code as is).
  
  2. What's the point of the gcs_send_heartbeat or gcs_data_stream_send functions? We already have send_heartbeat and data_stream_send functions, so I don't understand what those do.
  
  I'm new with this code, so forgive me if my questions were answered elsewhere. I've looked through that guide and the Mavlink Guide for Dummies, as well as a few forum posts, extensively and have yet to find satisfactory answers.

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Displaying new messages on Mission Planner

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