…_MESH_SERIAL

…out the life of the program

On get_val_req path, where cmd_rsp is filled with val_get.data

Reduced dynamic allocation to just data array in app_evt, freed once it
is handled in main()

Handle equals the pin to change (0 to 32)

…andler

Created mesh_update wrapper for rbc_mesh_value_set to update a changing
data value.

Introduced value refresh serial & mesh commands to prompt the device
that owns an analog input to update the analog value across the mesh.

Includes “ping” interface to prompt other devices to update values.

RECEIVER prints out all received events