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We've all been there: https://twitter.com/cpu4coffee/status/1377658574537646081

Finding a sample capture is usually the first hurdle: 10524 - Bluetooth Smart: Add GATT dissector

The value needs to be cast (tostring()) to a string for the add:

        local subtree = tree:add(trivial_proto, tostring(src_gatt_val), "Trivial Protocol Data")
        subtree:add(gattval_field,tostring(src_gatt_val))

The error message says it expects a "string" but got unformatted user data:

calling 'add' on bad self (string expected, got userdata)

    local src_gatt_val = ble_gatt_value()

Depending on how much the string will be needed, you might want another variable:

    if src_gatt_val then 
        --print(src_gatt_val)
        local src_gatt_val_str = tostring(src_gatt_val)
        local subtree = tree:add(trivial_proto, src_gatt_val_str, "Trivial Protocol Data")
        subtree:add(gattval_field,src_gatt_val_str)

    end

We've all been there: https://twitter.com/cpu4coffee/status/1377658574537646081

Finding a sample capture is usually the first hurdle: 10524 - Bluetooth Smart: Add GATT dissector

The value needs to be cast (tostring()) to a string for the add:

  local subtree = tree:add(trivial_proto, tostring(src_gatt_val), "Trivial Protocol Data")
      subtree:add(gattval_field,tostring(src_gatt_val))

The error message says it expects a "string" but got unformatted user data:

calling 'add' on bad self (string expected, got userdata)

    local src_gatt_val = ble_gatt_value()

Depending on how much the string will be needed, you might want another variable:

    if src_gatt_val then 
        --print(src_gatt_val)
        local src_gatt_val_str = tostring(src_gatt_val)
        local subtree = tree:add(trivial_proto, src_gatt_val_str, "Trivial Protocol Data")
        subtree:add(gattval_field,src_gatt_val_str)

    end

We've all been there: https://twitter.com/cpu4coffee/status/1377658574537646081

Finding a sample capture is usually the first hurdle: 10524 - Bluetooth Smart: Add GATT dissector

The value needs to be cast (tostring()) to a string for the add:

 local subtree = tree:add(trivial_proto, tostring(src_gatt_val), "Trivial Protocol Data")
 subtree:add(gattval_field,tostring(src_gatt_val))

The error message says it expects a "string" but got unformatted user data:

calling 'add' on bad self (string expected, got userdata)

    local src_gatt_val = ble_gatt_value()

Depending on how much the string will be needed, you might want another variable:

    if src_gatt_val then 
        --print(src_gatt_val)
        local src_gatt_val_str = tostring(src_gatt_val)
        local subtree = tree:add(trivial_proto, src_gatt_val_str, "Trivial Protocol Data")
        subtree:add(gattval_field,src_gatt_val_str)

    end